PREDICTING ADULT
OFFENDER RECIDIVISM:
WHAT WORKS!
1996-07
By
Paul Gendreau, Claire Goggin & Tracy Little
University of New Brunswick
The views expressed are those of the authors and are not necessarily
those of the Ministry of the Solicitor General of Canada.
This document is available in French. Ce rapport est disponible en
français sous le titre: Les techniques efficaces de prévision de la
récidive chez les délinquants adultes.
Public Works and Government Services Canada
Cat. No. JS4-1/1996-7E
ISBN: 0-662-25114-8
TABLE OF CONTENTS
Abstract
Executive Summary
Predicting Adult Offender Recidivism: WHAT WORKS!
Predictors of Recidivism
Actuarial Measures for Predicting Recidivism
METHOD AND PROCEDURE
Sample of Studies
Coding the Studies
Predictor Categories
Effect Size Calculation
Significance Testing
RESULTS
Predictor Domains: Category I
Predictor Domains: Category II
Actuarial Measures
DISCUSSION AND RECOMMENDATIONS
Predictor Domains
Actuarial Measures for Predicting Recidivism
Practical Suggestions for Practitioners
APPENDIX A
References
References in the Meta-Analysis
Abstract
Meta-analytic techniques were used to determine which predictor domains
and actuarial assessment instruments were the best predictors of adult
offender recidivism. One hundred and thirty-one studies produced 1141
correlations with recidivism. The strongest predictor domains were
criminogenic needs, criminal history/history of antisocial behaviour,
social achievement, age/gender/race and family factors. Less robust
predictors included intellectual functioning, personal distress factors
and socio-economic status in the family of origin. Dynamic predictor
domains performed at least as well as the static domains. Recommendations
for developing sound assessment practices in corrections were provided.
Executive Summary
Correctional policy makers and practitioners are faced with noticeable
increases in prison populations, burgeoning probation caseloads,
uncertain parole assessment guidelines, and the need to design more
effective offender treatment programs. Resolution of these issues is
indeed difficult. The literature on the assessment and prediction of
criminal behaviour, however, should provide some useful answers in this
regard.
Therefore, the purpose of this research project was to provide data on
five basic questions regarding the assessment and prediction of criminal
behaviour, (i.e., recidivism).
The questions were:
-
Which predictor domains predict
recidivism and are some more potent than others?
-
Are dynamic predictors as a group
inferior to static predictors in their ability to predict
recidivism?
-
Are there differences amongst composite
measures of risk prediction instruments and measures of antisocial
personality in their ability to predict recidivism?
-
Are the most robust predictors of
recidivism associated with different theories of criminal
behaviour?
-
What practical guidelines are forthcoming from this research that will
assist practitioners in making better assessments of criminal
behaviour?
The necessary information was generated from a meta-analysis of the
prediction of recidivism literature among adult offenders. One hundred
and thirty-one studies were identified which produced 1141 correlations
with recidivism.
The strongest predictors of recidivism were criminogenic need, criminal
history/history of antisocial behaviour, social achievement,
age/gender/race, and family factors. Weaker predictors included
intellectual functioning, personal distress (i.e., anxiety, self-esteem),
and social class of origin.
Dynamic predictors - those that measure change in the offender -
predicted recidivism as well as static predictors such as age and
criminal history.
Amongst the composite risk measures, the Level of Service Inventory
(LSI-R) generated higher correlations with recidivism than did other risk
measures (e.g., Salient Factor Score, Wisconsin) and measures of
antisocial personality. In the case of measures of antisocial
personality, the Psychopathy Check List (PCL-R) was superior to the MMPI
Pd scale/Megargee system and various other antisocial personality
scales. Differential association and social learning theories of criminal
conduct were associated with the strongest predictors of recidivism.
Several practical guidelines emanated from this meta-analysis that will
assist criminal justice practitioners in their goal of reducing prison
overcrowding, managing probation and parole caseloads effectively, and
designing better treatment programs.
1. The "ideal" assessment protocol should include, whenever possible, the
following content areas.
Static Predictors
-
age
-
criminal history - both as an adult and
juvenile and history of antisocial behaviour when the offender was
a youth
-
family factors - criminality, rearing practices, and structure
Dynamic Predictors
-
antisocial personality
-
companions
-
criminogenic needs
-
interpersonal conflict
-
social achievement
-
substance abuse
2. The available risk instrument that is closest to ideal is the LSI-R.
Revisions to existing measures such as the LSI-R or the development of
new instruments, should incorporate items that tap into the offender's
and his/her family's early antisocial history. The assessment of
antisocial or psychopathic personality may be best left to a separate
assessment protocol using the PCL-R.
3. The measurement of change - assessing offenders at different points in
time - should be done routinely.
4. The magnitude of the prediction of recidivism by any of the predictor
domains appears to be little affected by the choice of recidivism outcome
employed. Reconviction should be used in any circumstance but, obviously,
parole violation and re-incarceration should be gathered by parole and
prison authorities respectively.
5. Any correctional agency that has the professional integrity to: (a)
compare the ability of different assessment measures (e.g., LSI-R vs.
PCL-R) to predict recidivism, (b) assess the usefulness of new techniques
(e.g., Neutralization scale), (c) generate prediction data on promising
predictor domains and distinct groups of offenders (e.g., violent
offenders), will make a substantial contribution to our knowledge base,
which, in turn, will benefit practice in the field.
Predicting Adult Offender Recidivism:
What Works!
The efficient management of prisons, probation and parole service and the
development and evaluation of treatment programs is contingent, in part,
upon the adequacy of our knowledge concerning the predictors of criminal
behaviour. There are two questions in this regard. That is, what risk
factors are the most potent predictors of recidivism and which actuarial
instruments are best suited to that assessment?
In the case of prisons, the United States is the leader in incarceration
rates in the Western world, while Canada is usually ranked in the top
three (Mauer, 1994; Staff, 1993). It is estimated that 4,000,000
offenders will be imprisoned in the United States by the year 2000
(DiIulio, 1991). The continuing "war on drugs" and the recent "three
strikes and out" bill proposed by President Clinton and enthusiastically
adopted by many U.S. states may well prove DiIulio's pessimistic
projection to be accurate. In Canada, as compared to the U.S., there is
less punitiveness in sentencing for most crimes (Lynch, 1993), but the
trends for "getting tough" are emerging. Changes in juvenile justice
legislation and judges' sentencing practices, and the tightening of
parole guidelines are increasing Canada's incarceration rate perceptibly
(Leschied & Gendreau, 1994; Moon, 1995).
Thus, it comes as no surprise that prison overcrowding will likely become
worse. As a consequence, the ability of prison systems to manage
themselves in a humane and cost-efficient manner is being seriously
jeopardized. Two strategies have been suggested which will help alleviate
the stresses in this matter. First, medium and maximum security
institutions should be reserved only for those offenders who are
identified as being among the highest risk to re-offend. Lower risk
inmates should be transferred to minimum security prison placements or,
more preferably, to community based correctional facilities. Secondly, at
sentencing, lower risk offenders can be diverted to probation, thereby
avoiding the use of prisons altogether.
Similarly, probation and parole caseloads have increased by approximately
160% in the U.S. during the last decade (Austin, 1995). These
unprecedented increases have occurred at a time when some of the largest
states (e.g., California, New York), are cutting staff (Mencimer, 1993).
Probation officer caseloads have reached several hundred in some
jurisdictions (e.g., California). One partial solution to probation's
dilemma is to restrict officers' supervisory practices to offenders
designated as high risk. Parole boards find themselves in a Catch 22
situation. They are under pressure to reduce prison overcrowding by
granting more parole while, at the same time, responding to the public's
and politicians' demands that high risk offenders remain incarcerated.
The effectiveness of offender treatment programs also depends on our
knowledge of the predictors of recidivism (Gendreau et al., 1994). In
this regard, Andrews and Bonta (1994) developed an elegant
risk/need/responsivity theory of criminal conduct that links prediction
with treatment. We will focus on the risk and need principles as they
have the strongest implications for prediction.
The risk principle has two components. First, it states that treatment
will be effective when treatment services are matched with the offender's
risk of re-offending. A risk factor can be anything about the offender's
past or present circumstances and behaviour that is predictive of
criminal behaviour. Intensive services should be provided for higher risk
offenders and minimal services for lower risk offenders. Mismatching
level of service with offender risk has seldom shown reductions in
offender recidivism, in fact, in some studies increases have been
reported (Andrews et al., 1990a; Andrews et al., 1990b).
Secondly, Andrews and Bonta (1994) classified risk factors into two
categories: static and dynamic. Static risk factors (i.e., age, previous
convictions, early family factors) are aspects of the offender's past
that are predictive of recidivism but are not subject to change. On the
other hand, dynamic risk factors or needs reflect the present
circumstances and behaviour of the offender, and, as such, are mutable.
There are two types of offender needs: criminogenic and noncriminogenic.
Examples of criminogenic needs are offenders' attitudes, cognitions, and
behaviour regarding employment, education, peers, authority, substance
abuse and interpersonal relationships that lead to conflict with the law.
The importance of criminogenic needs rests in the promise that when
treatment programs target criminogenic needs, reductions in offender
criminal behaviour can reasonably be expected to occur (Andrews et al.,
1990a).
The evaluation of treatment programs depends on the availability of
accurate measures of risk. While randomized experiments are difficult to
achieve in corrections agencies, quasi-experimental designs utilizing
comparison groups can be readily created if offenders have been assessed
as to their risk level. In support of the point is that the Andrews et
al., (1990b) meta-analysis found the quality of the research design was a
minor factor in assessing the effectiveness of services. They endorsed
the use of evaluations that controlled for pretreatment risk levels if
randomized experiments were not possible.
As noted at the outset, the achievement of the above goals is predicated
on the assumption that practitioners and policy makers can arrive at a
consensus as to what are the best predictors of recidivism and the most
accurate prediction instruments available to assess recidivism based on a
reading of the relevant criminal justice literature. We now assess the
status of this assumption.
Predictors of Recidivism
There is little disagreement in the criminological literature about some
of the predictors of adult offender recidivism such as age, gender, past
criminal history, early family factors and criminal associates. There has
been, however, considerable controversy and/or lack of interest in
dynamic risk factors. There are three reasons for this. First, because of
ideological concerns and the professional self-interest of significant
segments of the professions of criminology and sociology, the import of
individual differences (i.e., offender needs, abilities, attitudes, and
personality styles) has been derided in some criminological literature
(cf., Andrews & Wormith, 1989; Rowe & Osgood, 1984; Wilson &
Herrnstein, 1985).
Secondly, some methodologists (e.g., Jones, 1996) have expressed
scepticism about dynamic risk factors because of their supposed
unreliability. Unlike their static counterparts, dynamic risk factors can
change over time and their measurement involves some degree of
subjectivity. Since elementary psychometric theory reminds us that
unreliability in measurement necessarily leads to an underestimation of
validity (Cronbach, 1990), this line of reasoning implies that,
collectively, dynamic variables must be relatively weak predictors of
criminal behaviour.
Thirdly, criminal justice professionals have been, by and large,
seemingly oblivious to the possibility that assessment of criminogenic
needs might enhance the prediction of criminal behaviour (Bonta, 1996;
Gendreau & Ross, 1987). The widely used Wisconsin classification
system (Baird, 1981) illustrates this point. This instrument contains a
useful needs component, but Bonta (1996) found just two studies that
reported on the predictive validity of these items. Furthermore, the
emergence of the "new penology" (Feeley & Simon, 1992), which is
concerned with managing large aggregates of offenders in a simplistic
input-output business-like fashion, has further contributed to the lack
of interest in dynamic variables.
This denial of the utility of dynamic risk factors, obviously, has
serious ramifications for corrections professionals who are routinely
required to reclassify offenders for prison transfers, parole/probation
supervision, and treatment services. Simply put, reclassification is
devalued if the measurement of change has little validity.
Three specific types of predictors have also been the subject of much
debate. They are social class of origin, intelligence, and personal
distress. Social class of origin (i.e., parents occupation, education),
has been the bedrock variable used in support of sociological theories of
crime that assert that criminal behaviour is determined largely by one's
social location (cf., Andrews & Bonta, 1994). Tittle and Meier (1990;
1991) have challenged this view, showing social class of origin (SES) to
be a very weak predictor of juvenile delinquency.
The notion that criminals are less intelligent than nonoffenders has been
prevalent for decades (cf., Goddard, 1920). Over the years, a number of
studies have demonstrated a correlation between intelligence and
delinquency (Hirschi & Hindelang, 1977). Recently, with the
publication of The Bell Curve (Herrnstein & Murray, 1994),
arguably the strongest claim yet has been made that IQ is a particularly
powerful predictor. Their conclusions have implications for the provision
of treatment programs for offenders, since IQ, in their view, is
considered to be largely immutable.
According to Andrews et al. (1990a) personal distress variables (e.g.,
low self-esteem, anxiety) are not risk factors and are, therefore,
inappropriate targets for treatment. Their conclusions are in stark
contrast to the practices of many therapists and programs that give
priority to lowering offenders' anxiety level and raising their
self-esteem. The genesis of this perspective is, most likely, a
consequence of the training received in mental health theory and practise
(e.g., psychodynamic theory, phenomenology), where treatment
professionals initially gained experience before emigrating to
corrections in the 1960s (Gendreau, 1996). The current widespread
popularity of the recovery and self-help agendas (see Kaminer, 1992)
lends further credibility to the notion that personal distress factors
are suitable targets for intervention, a view which has, in our opinion,
generalized to corrections where surveys of treatment programs have found
that it is not uncommon for programs to attempt to alleviate offenders'
personal distress (Gendreau et al., 1990; Hoge et al., 1993).
To date, reviews of the evidence concerning the predictors of recidivism
have been limited in scope and have been narrative in nature - except for
two reviews that employed meta-analytic procedures. One meta-analysis,
however, was quite preliminary (Gendreau et al., 1992) while the other
was restricted to twin and adoption studies that combined juvenile and
adult samples (Walters, 1992).
Actuarial Measures for Predicting
Recidivism
Bonta (1996) has categorized risk assessment measures within a
developmental framework. First generation techniques are based on
clinical intuition and professional judgement. There is a plethora of
literature documenting the lack of validity of this approach (cf., Meehl,
1954), even amongst the most highly trained clinicians and scholars
(Little & Schneidman, 1959). This perspective is still commonplace
among corrections professionals (Clear & Gallagher, 1985).
Second generation assessments are actuarial in nature. They are based on
standardized, objective risk prediction instruments, such as the Salient
Factor Score (SFS) (Hoffman, 1983) that are based almost entirely on
static criminal history items. These kinds of measures provide little
direction for classification and treatment decisions because the fixed
nature of the items does not allow for changes in the offenders behaviour
to be reflected in subsequent re-testing.
Bonta's third generation consists of two types of instruments. One of
them encompass risk prediction measures that include dynamic factors
(e.g., Community Risk/Needs Management Scale, Motiuk, 1993; Level of
Service Inventory (LSI-R), Andrews & Bonta, 1995; the Wisconsin,
Baird, 1981) which assess a wide range of criminogenic needs. The second
type includes personality test scales in the antisocial
personality/sociopathy/psychopathy content area. While these scales
(e.g., the MMPI Pd scale, the Psychopathy Checklist (PCL-R), Hare,
1991; the Socialization scale (Soc) of the California Personality
Inventory (CPI), Gough, 1957) do contain static items, the majority are
dynamic in nature.
Reviews of the risk measure literature have also been, with one exception
(Simourd et al., 1991), narrative in nature. Their meta-analysis reported
that the PCL-R and the Soc scale of the CPI were better predictors
of recidivism than the MMPI Pd scale. Unfortunately, most of the
studies available to the authors were postdictive.
A final comment concerns the fact that the validity of various theories
of criminal behaviour relies, somewhat, on the prediction literature.
Anomie/strain (Merton, 1957) and sub-cultural theories (Cohen, 1955;
Matza, 1964) support SES and, to some extent, personal distress, as
strong predictors. Contemporary reformulations of differential
association, social learning, and control theories (Andrews & Bonta,
1994; LeBlanc et al., 1988; Widom & Toch, 1993) centre on antisocial
peers, learned antisocial values, early criminogenic family factors, and
personality dimensions (e.g., egocentricity). Strong biologically
oriented theories base much of their credence on IQ and twin studies (see
Herrnstein & Murray, 1994; Walters, 1992).
In summary, our review of the predictors of recidivism literature for
adult offenders has indicated a need for a comprehensive, quantitative
research synthesis (i.e., meta-analysis) of the major classes of the
predictors of recidivism and of the available prediction instruments. The
potential advantages of meta-analysis over narrative reviews have been
summarized in detail elsewhere (Cooper & Hedges, 1994). It has become
the review method of choice in many applied areas (e.g., Lipsey &
Wilson, 1993) and has recently led to advances in knowledge in the
correctional field (Andrews et al., 1990b; Bonta & Gendreau, 1990;
Gendreau & Andrews, 1990; Lipsey, 1992; Walters, 1992).
The questions we address in this study are as follows:
-
Which predictor domains predict recidivism
and are some more potent than others?
-
Are dynamic predictors as a group inferior
to static predictors in their ability to predict recidivism?
-
Are there differences amongst composite
measures of risk prediction instruments and measures of antisocial
personality in their ability to predict recidivism?
-
Are the strongest predictors of recidivism
associated with different theories of criminal behaviour?
-
What guidelines are forthcoming from the meta-analysis that will assist
criminal justice professionals in making more accurate assessments of
criminal behaviour?
METHOD AND PROCEDURE
Sample of Studies
A literature search for relevant studies published between January 1970
and June 1994 was conducted using the ancestry approach and library
abstracting services. For a study to be included, the following criteria
applied:
-
Data on the offender was collected prior to
the recording of the criterion measures. A minimum follow-up
period of six months was required. If a study reported more than
one follow up period, data from the longest interval was used.
-
Treatment studies that directly
attempted to change offender personality or behaviour were not
included.
-
The criterion or outcome measure of
recidivism had to be recorded when the offender was an adult (18
years or more).
-
The criterion or outcome measure
had to have a no-recidivism category. Studies that used "more" vs.
"less" crime categorizations were not used. The criterion measures
were arrest, conviction, incarceration, parole violation or a
combination thereof.
-
The study was also required to report statistical information that
could be converted, using meta-analytic formulae (Rosenthal, 1991) into
the common metric or effect size of Pearson r.
Coding the Studies
For each study the following information was recorded:
-
Coder characteristics: date, coder
identity.
-
Study characteristics: published document,
type of publication, funding source, multi-disciplinary
authorship, judgement of senior author's knowledge of the area,
gender of authors, affiliation of authors, geographic location of
study, decade in which study was published.
-
Study sample characteristics: age, gender,
race, urban/rural, socio-economic status, risk level, crime
history, psychological make-up.
-
Study methodology: extreme groups design, attrition, follow-up length,
type of outcome measure, sample size, statistical value.
The accuracy of coding was assessed using the index: agreement = # of
agreements ÷ (# of agreements + # of disagreements) (Yeaton &
Wortman, 1993). The second author coded all studies. The first author
blindly coded a random sample of 30 studies. Percentage agreement scores
for the two raters ranged from 85% to 98% across coding categories. Where
disagreements occurred, the coding used was based on the first author's
classification.
Predictor Categories
The predictors were initially sorted into 18 domains (Category I). Their
coding criteria are detailed in Appendix A. Then, for the purposes of
research synthesis, the 18 domains were collapsed into eight
all-encompassing predictor domains (Category II): a) age/gender/race, b)
criminal history, c) criminogenic needs, d) family factors, e)
intellectual functioning, f) personal distress, g) SES, and h) social
achievement.
Effect Size Calculation
Pearson product-moment correlation coefficients were produced for all
predictors in each study that reported a numerical relationship with the
criterion. When statistics other than Pearson r were presented,
their conversion to r was undertaken using the appropriate
statistical formulae (Rosenthal, 1991). Where a p value of greater
than .05 was the only reported statistic, an r of .0 was assigned.
Next, the obtained correlations were transformed using Fisher's table.
Then, according to the procedures outlined by Hedges and Olkin (1985, p.
230-232), the statistic z±, representing the weighted estimation
of Pearson r, was calculated for each predictor domain by dividing
the sum of the weighted zrs per predictor domain by the sum of
each predictor's sample size minus three across that domain.
In order to determine the practical utility of various predictors
relative to each other, the common language (CL) effect size
indicator (McGraw & Wong, 1992) was also employed. The CL
measure is little affected by changes in base rates and selection ratios
making it ideal for prediction studies (Rice & Harris, 1995a). The
CL statistic converts an effect size into the probability that a
predictor-criterion score sampled at random from the distribution of one
predictor domain (e.g., criminogenic needs) will be greater than that
sampled from another distribution (e.g., personal distress).
Significance Testing
To determine which of the predictor domains predicted criterion
significantly different from zero, the mean z± values
for each domain were multiplied by the value of (N -
3k)1/2, where N =
the number of subjects per
predictor domain and k = the number of predictors per domain
(Hedges & Olkin, 1985).
One-way ANOVAs and the Student-Newman-Keuls (SNK) multiple comparison
test were then applied to the mean r values of those domains which
significantly predicted criterion better than zero in order to assess
which domains differed significantly from each other.
Mindful of the debate regarding alternatives to the use of parametric
methods as tests of significance in meta-analyses, the mean
z± values for significant predictor domains were also
assessed using an analogue to the ANOVA's F-test, the
goodness-of-fit statistic Q (Hedges & Olkin, 1985). Following
that, post-hoc comparisons of the differences between mean
z± values of each pair of significant predictor domains
were conducted using the z test (E. Marchand, personal
communication, June 15, 1994).
Finally, one-way ANOVAs and the SNK test using Pearson r were
employed to assess whether type of outcome criteria, length of follow-up,
and study characteristics were related to effect size.
The CL statistic does not involve significance testing.
Unless otherwise specified, alpha was set at .05 2-tail for all
significance tests.
RESULTS
One hundred and thirty-one studies were identified as suitable for the
meta-analysis. These studies generated 1141 effect sizes with future
criminal behaviour.
For those variables where at least 60% of the studies reported
information on the study characteristics sampled, the results were as
follows: a) 86% of the studies were published, 58% in journals, b) 73% of
the senior authors had published in the area previously, 51% of the them
were male, c) 44% and 54% of authors were based in an academic and
government agency setting respectively, d) the studies were evenly
distributed across the decades with the majority emanating from the
United States and Canada, although Canadian studies contributed the
majority (63%) of effect sizes, e) 95% of studies consisted of male or
mixed samples, f) only 5% of studies employed an extreme groups design
and g) 83% did not suffer subject attrition of more than 10% of their
sample.
Predictor Domains: Category I
Table 1 presents the mean effect sizes for the 18 levels of Category I in
conjunction with the number of effect sizes (k) and the total
number of subjects associated with each predictor domain (N). The
domains are grouped as follows: static (n = 10), dynamic (n
= 7) and composite measures (n = 1).
Table 1
Mean effect sizes for predictor domains: Category I
Predictor (k)
|
N
|
r(SD)
|
z±
|
Statica
|
1. age (56)
|
61,312
|
.15(.12)4
|
.11*
|
2.
criminal(164) history: adult
|
123,940
|
.18(.13)1
|
.17*
|
3. antisocial
history: pre-adult (119)
|
48,338
|
.13(.13)4
|
.16*
|
4. family
criminality (35)
|
32,546
|
.12(.08)
|
.07*
|
5. family
rearing (31) practices
|
15,223
|
.15(.17)4
|
.14*
|
6. family (41)
structure
|
24,231
|
.10(.08)
|
.09*
|
7. gender (17)
|
62,021
|
.10(.07)
|
.06*
|
8. intellectual
(32) functioning
|
21,369
|
.07(.14)
|
.07*
|
9. race (21)
|
56,727
|
.13(.15)
|
.17*
|
10. SES (23)
|
13,080
|
.06(.11)
|
.05*
|
dynamicb
|
11. antisocial
(63) personality
|
13,469
|
.18(.12)2
|
.18*
|
12. companions (27)
|
11,962
|
.18(.08)3
|
.21*
|
13.
criminogenic (67) needs
|
19,809
|
.18(.10)1
|
.18*
|
14.
interpersonal (28) conflict
|
12,756
|
.15(.10)4
|
.12*
|
15. personal
(66) distress
|
19,933
|
.05(.15)
|
.05*
|
16. social
(168) achievement
|
92,662 |
.15(.14)3 |
.13* |
17. substance
abuse (60) |
54,838 |
.14(.12)4 |
.10* |
Composite
Measures |
18. risk scales
(123) |
57,811 |
.30(.14) |
.30* |
|
|
|
|
Note. k = effect sizes per predictor domain; N = subjects per predictor domain; SD =
standard deviation
a F(16, 1001)
= 5.59, p < .05.
12, 13 vs. 6,
8, 10, 15; 211 vs. 8, 10, 15; 312, 16 vs. 8, 15; 41, 3, 5, 14, 17 vs. 15;
Student-Newman-Keuls post-hoc comparison, p < .05.
*p < .05.
The following is an example of how to read
Table 1. Across the 131 studies sampled, a quantitative relationship
between the predictor age and recidivism was reported on 56
occasions involving a total of 61,312 subjects. The associated mean
Pearson r for age with outcome was .15
(SD = .12), with younger age being
positively correlated with poorer outcome. Mean z±, the
weighted estimation of Pearson r for age
with outcome, was .11. Application of Hedges and Olkin's (1985)
method for testing the significance of the mean z± values
confirmed age as a significant predictor of recidivism.
All predictor domains were significant
predictors of recidivism. The largest mean r values were found for adult criminal
history, antisocial personality, companions, and criminogenic needs.
Risk scale measures, which contained information from several
predictor domains, produced the highest mean r value with recidivism (.30).
The conclusions reached by the parametric
(ANOVA, SNK) statistical analysis were virtually identical to those
of the F-test analogue (Q, Z-test
comparison). We report the results of the standard parametric
analysis.
A one-way ANOVA applied to the mean r values (excluding composite risk scales)
indicated there was a significant difference across the predictor
domains [F(16, 1001) = 5.59]. A Student
Newman - Keuls (SNK) multiple comparison test of the mean r values are specified in Table 1. Adult
criminal history, and criminogenic needs produced the greatest
frequency of significant differences. Each of these were
significantly different from family structure, intellectual
functioning, personal distress, and SES.
Predictor Domains: Category II
With the exception of the risk scales domain,
the 17 predictor domains from Category I were collapsed into 8
groups. All predictor domains were significantly greater than 0 (see
Table 2). There were significant differences among the eight
predictor domains [F(7, 1010) = 10.00].
The SNK multiple comparison test of the mean r values revealed that the predictor domains
criminal history and criminogenic needs were significantly greater
than those of family factors, intellectual functioning, personal
distress, SES.
Table 2
Mean effect sizes for
predictor domains: Category II
Predictor (k) |
N |
r(SD) |
z± |
Statica |
- age/gender/race (94)
|
180,060 |
.14(.12)3 |
.11* |
- criminal (282)
historyc
|
171,159 |
.16(.13)1 |
.16* |
3. family
factors (107) |
72,000 |
.12(.12)3 |
.08* |
- intellectual (32)
functioning |
21,369 |
.07(.14) |
.07* |
- SES (23)
|
13,080 |
.06(.11) |
.07* |
Dyanmicb |
- criminogenic (246)
needs factorsd |
113,153 |
.17(.11)1 |
.14* |
- personal (66)
distress |
19,933 |
.06(.15) |
.05* |
- social (168)
achievement |
92,662 |
.15(.14)2 |
.13* |
|
Table 2 continued
|
Predictor (k) |
N |
r(SD) |
z± |
Static
versus Dynamicb |
- static (536)
|
457,552 |
.12(.14) |
.11* |
10. dynamic
(482) |
226,664 |
.15(.13) |
.13*
|
Note. k = effect sizes per predictor domain; N = subjects per predictor domain; SD =
standard deviation
ccriminal
history = adult plus pre-adult; dcriminogenic need factors = antisocial
personality, companions, interpersonal conflict, criminogenic needs,
and substance abuse.
a F(7, 1010) =
10.00, p < .05; b F(1,1016) =
6.18, p < .05.
12, 6 vs. 3,
4, 5, 7; 28 vs. 4, 5, 7; 31, 3 vs. 4, 7; Student-Newman-Keuls
post-hoc comparison,
p < .05.
*p < .05.
The eight predictor domains were classified
into dynamic and static factors. The dynamic grouping consisted of
criminogenic needs factors, personal distress, and social
achievement. The mean r values for
dynamic (.15) and static (.12) were significantly different [F(1,
1016) = 6.18].
The common language effect size indicator (CL) provided another approach to examining
the relative usefulness of the 8 predictor domains from Table 2 as
well as the static-dynamic comparison. The CL scores, summarized in Table 3, indicate
the percentage of time that one of a pair of predictors produced
larger correlations with outcome.
Table 3
Common language effect
size indicatorsa
|
CH |
CN |
F |
I |
PD |
SES |
SA |
AGRb |
(54) |
(58) |
54 |
64 |
66 |
68 |
(53) |
CH |
- |
(52) |
58 |
68 |
69 |
71 |
51 |
CN |
|
- |
62 |
71 |
73 |
75 |
54 |
F |
|
|
- |
61 |
63 |
64 |
(57) |
I |
|
|
|
- |
52 |
51 |
(66) |
PD |
|
|
|
|
- |
(52) |
(68) |
SES |
|
|
|
|
|
- |
(70)
|
aCommon
language effect size indicators for mean r values. Bracketed values favour vertical
axis; unbracketed values favour horizontal axis.
bAGR = age,
gender, race; CH = criminal history/history of antisocial behaviour;
CN = criminogenic need factors; F = family factors; I = intellectual
functioning; PD = personal distress; SES = social class of origin;
SA = social achievement.
Table 3 can be read in the following way.
With regard to direction, unbracketed scores favour the horizontal
axis predictor while bracketed scores favour the vertical axis
predictor. For example, in comparing criminogenic needs (CN) with
personal distress (PD), one can see that 73% of the time CN produced
higher correlations with recidivism than did PD.
In the case of the static-dynamic comparison
(Table 2) the CL score was 54% in favour
of the dynamic predictor domain.
Actuarial Measures
Table 4 summarizes the mean effect sizes of
the composite risk and personality scales with recidivism. All of
the instruments predicted recidivism significantly different from
zero. Amongst the risk scales, the LSI-R produced the highest
correlation with recidivism (r = .35) but
it was not significantly greater than the SFS, Wisconsin or the
other risk scale domains [F(3, 119) =
1.52]. The Other domain consisted of SFS clones, that is,
instruments containing about 5-10 items, almost all of which were
static in nature.
Table 4
Mean effect sizes for
Risk and AntiSocial Personality Scales
Predictor (k) |
N |
r(SD) |
z+ |
Risk
Scalesa |
1. LSI-R (28)
|
4,579 |
.35(.08) |
.33* |
2. SFS (15) |
9,850 |
.29(.10) |
.26* |
3. Wisconsin
(14) |
14,092 |
.27(.08) |
.32* |
4. other (66)
|
29,290 |
.30(.17)0 |
.30* |
Table 4 continued
|
Predictor (k) |
N |
r(SD) |
z+
|
Antisocial
Personality Scalesb
5. MMPI based
(16) |
3,420 |
.16(.09) |
.21* |
6. PCL (9) |
1,040 |
.28(.09)1 |
.29* |
7. other (37)
|
8,875 |
.16(.13) |
.16* |
|
|
|
|
Note. k = effect sizes per predictor domain; N = subjects per predictor domain; SD =
standard deviation.
a F(3, 119) =
1.52, p < .05; b F(2,59) = 4.01, p
< .05.
16 vs. 5, 7;
Student-Newman-Keuls post-hoc comparison, p < .05.
*p < .05.
The LSI-R produced CL scores of 76% and 67% with the Wisconsin
and SFS respectively when mean r was the
dependent variable.
A comparison of the mean r values associated with the antisocial
personality measures revealed a significant difference between
measures [F(2, 59) = 4.01]. The SNK
multiple comparison test reported that the PCL was a significantly
better predictor than either the MMPI based measures or Other
domain. CL analysis indicated that 83% of
the time the PCL produced larger Pearson r correlations with recidivism than did the
MMPI. The Social Achievement domain (accommodation, education,
employment, and marital status) showed r's ranging from .15-.16.
Within the personal distress domain, 24 of 66
effect sizes tapped psychiatric symptomatology. The mean r (SD) was .00 (.17). Family factors did not
include studies from the gene-crime relationship as Walters (1992)
has already conducted a meta-analysis in this area. However, data
from Tables 2 and 3 of Walter's (1992) study yielded a mean r and z± of
.08, indicating that genetic background was a significant predictor
of recidivism.
Practitioners occasionally ask which official
measure of recidivism is the most sensitive. Four outcomes - arrest,
conviction, incarceration, and parole violation - were compared.
Mean effect size values ranged from .13 to .19. The mean r values associated with incarceration were
significantly greater than those of conviction or parole violation
[F(3, 894) = 6.71]. In all comparisons,
however, the CL scores were less than
60%.
DISCUSSION AND
RECOMMENDATIONS
Prior to discussing the results it must be
noted that the generalization of the results of any meta-analysis is
limited by the nature of the studies examined.
Some valuable studies (e.g., Gendreau et al.,
1979) could not be used because the researchers reported their
results in formats (e.g., regression analyses) from which Pearson r's could not be calculated.
Little attempt was made to retrieve
unpublished studies that were not immediately available. A common
assumption is that one of the reasons that some studies are not
published is because they may be lacking in methodological rigour
which, in turn, affects the magnitude of effect sizes (see Lipsey
& Wilson, 1993). Lipsey & Wilson's (1993) analysis applied
to treatment studies but, so far, prediction studies have not shown
similar results (Goggin & Gendreau, 1995).
Another methodological point concerns one of
the goals of meta-analysis. Hunter & Schmidt (1990) are
interested in determining the maximum value that can be obtained in
prediction if all variables were perfectly measured. Others insist
that the goal of meta-analysis is to "teach us better what is, not what might some day be in the best
of all possible worlds..." (Rosenthal, 1991, p. 25). We are of the
latter view and did not attempt to statistically adjust for
methodological artifacts, which may or may not have had an impact on
the magnitude of the effect sizes obtained.
The data base was, regrettably, virtually
silent on the prediction of recidivism among female offenders,
minority groups, "white collar" offenders, and some important sample
characteristics such as risk level and the psychological make-up of
the subjects studied. Much of the effect size data on dynamic
predictor domains came from Canada where there has been a strong
emphasis on the assessment of individual differences (cf., Andrews
& Bonta, 1994).
One should not assume that many of the
correlations found in this meta-analysis (i.e., .10 - .30) are
inconsequential. In fact, mean r values
in this range can be indicative of substantial practical import
(Hunter & Schmidt, 1990; Rosnow & Rosenthal, 1993). Indeed,
the percentage improvement in predicting recidivism can equal the
actual value of r (Rosenthal, 1991, p.
134), assuming base rates and selection ratios that are not in the
extreme.
The fact that the data base consisted of just
over 1,000 effect sizes involving almost 750,000 S's suggests that reasonable confidence can
be placed in the results. Additional research, in our view, is not
likely to change the direction or ordering of the results of the
predictor domains to any marked degree.
The remainder of the discussion addresses the
questions raised in the introduction.
Predictor Domains
The meta-analysis provided further
confirmation of the narrative reviews which concluded that variables
such as age, criminal history, companions, family factors, gender,
social achievement, and substance abuse are significant and potent
predictors of recidivism. On the other hand, it offered some
important insights into several other predictor domains.
The time is long past when those offender
risk factors that are dynamic in nature can be cavalierly ignored.
Indeed, criminogenic needs produced higher correlations with
recidivism (see Table 3) a much higher percentage of the time than
did several other predictor domains. When considering all predictor
domains, a statistically significant difference was found in favour
of dynamic risk factors, but the CL
effect size indicator was only 54%. Moreover, the two major static
and dynamic categories, criminal history and criminogenic needs,
were almost identical in predicting recidivism. While very few
studies have assessed how well changes over time within dynamic
factors predict recidivism, the data suggest that changes on
criminogenic needs may produce strong correlations in that regard.
Early family factors and history of pre-adult
antisocial behaviour are rarely included in adult offender risk
prediction instruments. Fortuitously, a number of estimable studies
(producing 103 effect sizes) were located that followed offenders
from early years to adulthood. The combined family factors domain
(Table 2) and pre-adult history of antisocial behaviour (Table 1)
produced correlations of .12 and .13 with recidivism respectively,
demonstrating once again that antisocial risk factors in childhood
can have far reaching influence (e.g., Stattin & Magnusson,
1989).
Much controversy has focused upon how well
personal distress, intelligence, and SES predict recidivism (Andrews
& Bonta, 1994; Herrnstein & Murray, 1994; Tittle &
Meier, 1990). From a treatment standpoint, the important result
centred on the fact that personal distress turned out to be quite a
weak predictor of recidivism. Moreover, one of the components of
this domain, psychiatric symptomatology, which has
characteristically been perceived as an important predictor of
re-offending in the field of psychiatry (cf., Phillips et al.,
1988), did not correlate (r = .00) with
recidivism. This finding was based on few effect sizes; more
research is needed to confirm this tentative result.
It would be reasonable, therefore, to assume
that programs that insist on alleviating offenders' personal
distress, as many do (Gendreau et al., 1994), will have little
success in reducing offender recidivism. Meta-analyses of the
offender treatment literature (e.g., Andrews et al., 1990b) are also
supportive of this conclusion.
The studies in the meta-analysis that
included measures of IQ were of the "traditional" sort (i.e.,
standard paper and pencil tests that measured linguistic and
mathematical abilities). Granted, these sorts of IQ measures can
produce modest correlations with criminal behaviour over long
periods of time (Moffitt et al., 1994), it is generally agreed that
this type of IQ assessment has reached its limits (Gardner, 1995). A
much more productive strategy would be to focus on what is called
practical or tacit intelligence, which is defined as the ability to
learn and profit from experience, effectively monitoring one's own
and other's feelings and needs, and solve the problems of everyday
life (Gardner, 1983; Sternberg et al., in press).
This meta-analysis extended Tittle and
Meier's (1990; 1991) pessimistic conclusions regarding the social
class - crime link with delinquent samples to that of adult
offenders. It is difficult to judge how social class theories will
evolve in the future; for speculations on this matter see Andrews
& Bonta (1994) and Tittle & Meier (1990). The most probable
scenario is that social class theories will incorporate more
psychological concepts (e.g., Agnew, 1992).
How well might the results from the
meta-analysis generalize to specialized offender groups? Few
violence prediction studies that predicted the occurrence of
violence vs. no criminal activity were retrieved. Our reading of the
literature indicates that the strongest predictors identified in
this meta-analysis also apply to violent offenders (Harris et al.,
1993; Reiss & Roth, 1993). As well, composite measures of
general recidivism (i.e., LSI-R) correlate highly (r = .78) with measures intended to predict
violence (i.e., PCL-R) (Loza & Simourd, 1994). One area where
the predictors of violent offending may be quite different is in the
area of impulsivity combined with overly hostile attributions of
other peoples intent (Serin & Kuriychuk, 1994). Sex offenders
present a somewhat different picture. At the risk of generalizing
across such a complex group, there do appear to be a few predictors,
centring on the offense itself, that are unique to this population
(Hanson & Bussière, 1995). Moreover, factors that predict sexual
violence are different than those that predict other types of
violence (Bonta & Hanson, 1995).
In regard to theory development, the results
from the meta-analysis are most supportive of recent advancements in
differential association and social learning theories (see Andrews
& Bonta, 1994, p. 104-124). These authors assert that, from the
perspective of these theories, it is absolutely essential that
criminogenic needs and antisocial associates be two of the strongest
correlates of criminal conduct. Criminogenic needs establish the
standards of conduct and generate the rationale for engaging in
antisocial behaviour. Antisocial associates provide the opportunity
for antisocial modelling to occur, govern the rewards and costs of
such behaviour, and influence antisocial attitudes.
The less potent predictors in this
meta-analysis (e.g., SES, personal distress, intellectual
functioning) have traditionally been associated with the
anomie/strain, subcultural, and biologically-oriented theories.
Actuarial Measures for Predicting
Recidivism
Composite measures of risk, on average,
produced substantially greater correlations with recidivism than
antisocial personality scales. This is not surprising, because risk
measures generally sample from a much wider variety of predictor
domains than personality scales.
Amongst the former, the LSI-R produced higher
correlations with recidivism than the SFS, the Wisconsin, or the
Other category. While the mean differences among the four measures
were not statistically significant, the CL effect size indicator provided a result
of practical importance. The LSI-R produced larger correlations with
recidivism than did the other three risk measures between 62% and
76% of the time.
The LSI-R, therefore, appears to be the
current measure of choice. An impressive volume of studies
confirming its predictive validity with recidivism and prison
adjustment has been generated for a variety of offender populations
(i.e., adults, juveniles, natives, females) (Andrews & Bonta,
1995).
In the area of antisocial personality
assessment, a noteworthy finding was that Hare's (1991) PCL-R
produced significantly greater correlations with recidivism than the
widely used MMPI based systems. The PCL-R specializes in assessing
the psychopathic dimension of antisocial personality. It is
recommended by clinicians who are concerned with predicting violence
(Harris et al., 1993).
Practical Suggestions for Practitioners
One advantage of a meta-analysis is that a
thorough literature search uncovers some promising assessment
approaches and measures that, upon further investigation, may prove
to be highly useful for practitioners. Meta-analysis also encourages
professional judgement where necessary (Light & Pillemer, 1984).
Please be aware that these recommendations are based on very limited
research and the first author's experience and clinical judgement.
They are as follows:
- Consider measures that assess hostility
and/or aggression such as the Aggression Questionnaire (Buss &
Perry, 1992). Gendreau et al., (1979a) reported moderate
predictive validities on an earlier version of this test (i.e.,
Buss-Durkee, 1957). The fact that long-term follow-up studies of
aggression in childhood correlated so well (r = .30 range) with criminal behaviour in
later adulthood was impressive (Stattin & Magnusson, 1989).
- Utilize measures that tap into selfish,
narcissistic antisocial behaviour, criminal sentiments, and
rationalizations for criminal behaviour (e.g., Walters &
Chlumsky, 1993; Shields & Simourd, 1991; Shields &
Whitehall, 1994).
- Do not limit assessments of education and
employment to just an offender' s past performance in this area.
Measure current attitudes and performance regarding work and skill
development. Substantial predictive validity could result
(Gendreau et al., 1979a; Jenkins et al., 1977).
- Pursue the usefulness of actuarial
measures and predictor domains which zero in on offenders that
specialize in one type of offense such as violence, paedophilia,
or arson (Hare, 1991; Knight et al., 1994; Rice & Harris,
1994; Serin & Kuriychuk, 1994).
- Collect information on bio-medical factors
and relate these to future criminal behaviour. Data from this
domain may produce small but helpful predictive validities of
recidivism (cf., Raine, 1993). Prisons that have comprehensive
medical screening protocols should have a wealth of information
for future research.
- Update the knowledge base about the
predictive validities of commonly used psychological tests. There
have to be thousands of CPI and MMPI protocols sitting in prison
files that could be expediently analyzed to determine whether the
time and effort involved in using these tests in corrections is
worthwhile.
- Whenever possible, compare and combine
different types of assessment methods, such as structured
interviews, actuarial measures, and social history information
(see Andrews & Wormith, 1989; Gendreau et al., 1980; Rice
& Harris, 1995b). Predictive validities are certain to
increase.
In conclusion, the modest contribution from
this meta-analysis has been to clarify which predictor variables and
measures of risk will provide the most assistance to practitioners
and policy makers to reach their objectives of reducing prison
overcrowding, managing probation and parole caseloads effectively,
and designing better treatment programs.
APPENDIX A
CODING CRITERIA FOR PREDICTOR DOMAINS
Category I
Static Predictors
- age: at time of data
collection/assessment.
- criminal history: adult - prior arrest,
probation, jail, conviction, incarceration, prison misconducts.
- history of antisocial behaviour: pre-adult
- prior arrest, probation, jail, conviction, incarceration,
alcohol/drug abuse, aggressive behaviour, conduct disorder,
behaviour problems at home and school, delinquent friends.
- family criminality: parents and/or
siblings in trouble with the law.
- family rearing practices: lack of
supervision and affection, conflict, abuse.
- family structure: separation from parents,
broken home, foster parents.
- gender.
- intellectual functioning: WAIS/WISC,
Raven, Porteous Q score, learning disabilities, reading level.
- race: white vs. black/hispanic/native.
- social class of origin (SES):
socioeconomic status of parents (parental occupation, education or
income).
Dynamic Predictors
- antisocial
personality/sociopathy/psychopathy scales: MMPI Pd, Megargee system, EPI-Psychoticism,
CPI-Soc, PCL-R, DSM III personality
disorders, any indices of egocentric thinking.
- companions: identification/socialization
with other offenders.
- criminogenic needs: antisocial attitudes
supportive of an antisocial lifestyle and behaviour regarding
education, employment.
- interpersonal conflict: family discord,
conflict with significant others.
- personal distress: anxiety, depression,
neuroticism, low self-esteem, psychiatric symptomatology (i.e.,
psychotic episodes, schizophrenia, not guilty by reason of
insanity, affective disorder), attempted suicide, personal
inadequacy.
- social achievement: marital status, level
of education, employment history, income, address changes.
- substance abuse: recent history of
alcohol/drug abuse.
Composite Measures
18. LSI-R, SFS, Wisconsin, Other risk scales.
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