The Effects of Prison Sentences and Intermediate Sanctions on Recidivism: General Effects and Individual Differences
Table of Contents
- Executive Summary
- Appendix A
List of Tables
- Table 1. Mean Effect Size and Mean Weighted Effect Size by Type of Sanction
- Table 2. Mean Effect Size and Mean Weighted Effect Size by Length of Time Incarcerated
- Table 3. Mean Effect Size and Mean Weighted Effect Size by Type of Sanction by Age
- Table 4. Mean Effect Size and Mean Weighted Effect Size by Type of Sanction by Gender
- Table 5. Mean Effect Size and Mean Weighted Effect Size by Type of Sanction by Race
- Table 6. Mean Effect Size and Mean Weighted Effect Size by Type of Sanction by Quality of Design
- Table 7. Mean Effect Size and Mean Weighted Effect Size by Type of Sanction by Risk Level
Paula Smith, M.A. Claire Goggin, M.A. Paul Gendreau, Ph.D. Department of Psychology and Centre for Criminal Justice Studies University of New Brunswick, Saint John
The views expressed are those of the authors and are not necessarily those of the Portfolio of the Solicitor General of Canada. This document is available in French. Ce rapport est disponible en français sous le titre: Effets de l'incarcération et des sanctions intermédiaires sur la récidive : effets généraux et différences individuelles Also available on Solicitor General Canada's Internet Site www.publicsafety.gc.ca
Public Works and Government Services Canada, 2002
Cat No.: JS42-103/2002
We greatly appreciate the on-going support of Jim Bonta in our research endeavours in this area. The project was funded by Contract No. 1314-01-CG1/587 from Corrections Research and Development, Solicitor General of Canada. Requests for further information should be directed to Paul Gendreau; Email: email@example.com or Fax: 506-648-5814.
While we have previously reported on the effects of sanctions on recidivism (see Gendreau, Goggin, & Cullen, 1999; Gendreau, Goggin, & Fulton, 2000; Gendreau, Goggin, Cullen, & Andrews, 2000), the purpose of this investigation was to update the results from these previous reports and to examine the effects of sanctions for juveniles, females, and minority groups. One hundred and seventeen studies dating from 1958 involving 442,471 offenders produced 504 correlations between recidivism and (a) length of time incarcerated, (b) serving an institutional sentence vs. receiving a community-based sanction, or (c) receiving an intermediate sanction. The data was analysed using quantitative methods (i.e., meta-analysis) to determine whether prison and community sanctions reduced recidivism.
The results were as follows: type of sanction did not produce decreases in recidivism under any of the three conditions. Secondly, there were no differential effects of type of sanction on juveniles, females, or minority groups. Thirdly, there were tentative indications that increasing lengths of incarceration were associated with slightly greater increases in recidivism.
The essential conclusions from this study are consistent with those of the above-noted meta-analyses.
- Prisons and intermediate sanctions should not be used with the expectation of reducing criminal behaviour.
- On the basis of the present results, excessive use of incarceration may have substantial cost implications.
- In order to determine who is being adversely affected by time in prison, it is incumbent upon prison officials to implement repeated, comprehensive assessments of offenders' attitudes, values, and behaviours throughout the period of incarceration and correlate these changes with recidivism upon release into the community.
Since the mid-1970s, the use of sanctions or punishments has been promoted as an effective means of suppressing criminal behaviour (Wilks & Martinson, 1976). The two most common forms of punishment advocated by deterrence proponents have been incarceration and intermediate sanctions (e.g., intensive surveillance, electronic monitoring). Interestingly, no coherent empirical rationale has been posited to support the use of these strategies. In our surveys of these literatures (Gendreau, 1996) we have rarely encountered citations of the relevant experimental or clinical literatures (e.g., Matson & DiLorenzo, 1984). Rather, what passes as intellectual rigour in the sanctions field is a fervid appeal to common senseFootnote 1 or vaguely articulated notions that somehow just the "experience" of a sanction, the imposition of so-called direct and indirect costs or "turning up the heat", will magically change antisocial behavioural habits nurtured over a lifetime, and do so in relatively short orderFootnote 2 (cf. Andaneas, 1968; Erwin, 1986; Nagin, 1998; Song & Lieb, 1993).
What evidence is there then in support of incarceration and intermediate sanctions as useful punishers of criminal behaviour? Presumably, research studies in this domain should have been consistently reporting an inverse relationship between the severity of sanction and the consequent recidivism rate (i.e., a punishment suppression effect). A series of quantitative literature syntheses have recently summarized the results from such studies (cf. Cullen & Gendreau, 2000). The results from these meta-analyses (Gendreau et al., 1999; Gendreau, Goggin, Cullen, & Andrews, 2001) clearly did not favour a punishment hypothesis. Whether the studies involved comparisons of (a) incarcerates serving more vs. less time; (b) incarcerates vs. those receiving a community sanction; or (c) offenders receiving more severe vs. less severe intermediate sanctions, the results indicated more punishment was associated with either slight increases in recidivism (φ = .02 to .03) or no effect (φ = .00). Nor did these results support the existence of an optimal sentence length that would reduce recidivism, as has been posited by some economists (Orsagh & Chen, 1988) or that prisons were schools of crime (see Gendreau et al., 1999 for a detailed review). The only moderator effect found in the entire Gendreau data set was in the case of intermediate sanctions, where Intensive Supervision Programs (ISPs) that also included treatment services produced small reductions in recidivism (approximately 10%; Gendreau, Goggin, & Fulton, 2000).Footnote 3
Some important individual difference moderators, however, were not assessed in these meta-analyses; specifically, the effects of these three types of sanctions on females, juveniles, and minority groups. With regard to females, it strains credulity to justify why they should be singled out but apparently when shock probation was first implemented there was a sense in some quarters that it might prove beneficial to females in particular (cf., Vito, Holmes, & Wilson, 1985).Footnote 4 With respect to juveniles, some politicians and neo-conservative pundits have issued repeated calls to "get tough" with this population, in the belief that juveniles will be made more accountable in some fashion or other. This has led, for example, to the adoption of more punitive juvenile legislation in Canada (the Young Offenders Act, Leschied & Gendreau, 1986). Whether these notions, however, were linked to expectations of reduced offending in the minds of the advocates of this legislation is difficult to ascertain. Finally, we have not been aware of any calls for the enhanced effects of punishments on minority groups (no doubt, a search of the Internet would uncover some racist views) except to note that criminal justice policies in the U.S. have led to increased incarceration rates for some minority groups (Mauer, 1999). It is likely that proponents of such policies were primarily interested in achieving incapacitation effects.
Thus, the purpose of this meta-analysis was to update the results that we have previously reported regarding the three general classes of sanctions and to examine these results as they pertain to the aforementioned offender groups. We also examined the differential effects of quality of research design, length of time incarcerated, and offender risk level on effect size.Footnote 5 As to the latter, the early sanctions literature (Waldron & Angelino, 1977) as well as some economists (cf., Gendreau et al., 1999) have suggested that low risk offenders should benefit from sanctions.Footnote 6
Finally, there is some debate among meta-analysts as to the appropriate number of effect sizes to include per primary study. Our approach has been to include all available treatment and control group comparisons (e.g., Andrews, Zinger, Hoge, Bonta, Gendreau, & Cullen, 1990; see also Rosenthal, 1991) as, to do otherwise, is to exclude data that may shed light on some important theoretical issues and to increase sample size. Secondly, our research group places much more emphasis on a descriptive rather then inferential approach to research integration (Gendreau, Goggin, & Smith, 2000; see also Hunter & Schmidt, 1990). Other meta-analysts suggest a more cautious approach and have hypothesized the possibility that non-independent effect sizes may unduly effect the results (Lipsey & Wilson, 2001). Accordingly, we inspected the results for this potential confound.
Sample of Studies
A literature search for studies which examined the effects of time in prison or intermediate sanctions on recidivism and were available since completion of the last report (Gendreau, Goggin, & Fulton, 2000) was conducted using the ancestry approach and library abstracting services. The following were pre-requisites for study inclusion:
- Offender data was collected prior to recording recidivism results.
- Offenders were followed for a minimum of six months after completing the prison sentence or sanction.
- Sufficient information to calculate an effect size (phi coefficient (φ) or correlation) between the "treatment" condition (e.g., prison vs. no prison) and recidivism was reported.
- Eligibility criteria were extended to include DUI studies or treatment studies (e.g., cognitive behaviour therapy, education, substance abuse, etc.) that also employed a sanction, but not sanction studies with pre-post designs or studies reporting aggregate level data, which can wildly inflate results (Gendreau, Goggin, & Smith, 2001).
Coding of Studies
Appendix A contains the coding guide used in this study. A comment on the classification of sanction types and definitions of quality of research and risk level may be in order.
Surveys indicate that both the public and policy makers, as well as offenders, consider prison to be the most severe or effective punisher of criminal behaviour (DeJong, 1997; Doob, Sprott, Marinos, & Varma, 1998; van Voorhis, Browning, Simon, & Gordon, 1997; Wood & Grasmick, 1999). Of note, there is some discussion in the literature as to whether very short terms of incarceration (i.e., several months duration) may, in fact, be construed by offenders as less of a sanction than very onerous probation conditions (Wood & Grasmick, 1999), but this data is tentative as it is based on small samples and rests solely on offenders' perceptions (absent any recent comparative experience with the two sanctions).
Thus, for the more vs. less prison category, the greater punishment was the longer period of time incarcerated. In regard to the incarceration vs. community comparisons, the less severe sanction consisted of various probation conditions such as regular probation, which tended to predominate.
In the intermediate sanctions category, probationers who received a sanction such as electronic monitoring, fines, restitution, intensive surveillance, scared straight, or drug testing were included in the sanctions group and their post-program outcome was compared with those assigned to a lesser sanction such as regular probation, which typically consisted of infrequent contacts with correctional staff. Secondly, combinations of two or more intermediate sanctions were coded as more intensive and were compared with the effects of receiving only one type of sanction. Thirdly, offenders who experienced more intensive surveillance were compared with those who received less intensive surveillance (i.e., 8 hours vs. 2 hours of weekly surveillance). The comparison group for studies that used arrest as the sanction was a warrant/citation or no arrest group. Boot camp studies were included in the intermediate sanctions group as they are often preceded by a probation condition, and their comparison group was comprised of ISPs of any description or regular probation.
Studies designated as higher quality were those with random assignment (with no breakdowns in the procedure, i.e., < 20% attrition) or comparison group designs where the two groups were similar on at least five valid risk predictor domains (e.g., age, criminal history, antisocial values; see Gendreau, Little, & Goggin, 1996 for a more complete list of applicable domains).
A high risk sample was so designated on the basis of either (a) the study author's report, (b) risk measure norms, or (c) the comparison group's recidivism rate (i.e., high risk was defined as >16% recidivism at 1 year follow-up, >30% at 2 or more years of follow-up).
Finally, if anything, coders erred in favour of the sanction. Where possible, technical violations were not scored if other outcome criteria were available (i.e., ISPs sometimes produce abnormally high rates of technical violations given the probation conditions). In addition, some intermediate sanctions (e.g., boot camps) reported comparison group data on completers and dropouts. We included the effect sizes from completer groups only.
Effect Size Calculation
Details of our approach to generating correctional policies utilizing meta-analysis are available in Gendreau et al. (2000). Briefly, for this investigation, phi coefficients (φ) were produced for all treatment - control comparisons in each study that reported a numerical relationship with recidivism. In the event of a non-significant predictor-criterion relationship, where a p value greater than .05 was the only reported statistic, a φ of .00 was assigned.
Next, the obtained correlations were transformed into a weighted φ value (z+) that takes into account the sample size of each effect size and the number of effect sizes per type of sanction (Hedges & Olkin, 1985). Outcome was recorded such that a positive φ or z+ was indicative of a less favourable result (i.e., a greater sanction with higher recidivism rates).
Effect Size Magnitude
Assessment of the magnitude of the effect of various sanctions on recidivism was conducted by examining the mean values of φ and z+, as well as their respective 95% confidence intervals (CI). The CI is a range of values about the mean effect size that, a specified percentage of the time (i.e., 95%), includes the respective population parameter. The utility of the CI lies in its interpretability: if the interval does not contain 0 it can be concluded that the mean effect size is significantly different from 0 (i.e., better than chance alone), although one is advised that the decision to interpret it as such is arbitrary (Gendreau et al., 2000). Similarly, if there is no overlap between the 95% CIs of the mean effect sizes of two conditions (i.e., sanction vs. comparison group), then the mean effect sizes of the two would be assessed as being statistically different from one another at the .05 level.
The common language effect size statistic (McGraw & Wong, 1992) was also used to generate probablistic statements of the relative magnitude of varying lengths of incarceration on recidivism. Specifically, the CL statistic converts an effect size into the probability that a treatment criterion point estimate sampled at random from the distribution of one treatment (more incarceration) will be greater than that sampled from another (less incarceration).
Table 1 summarizes the results for each of the major sanctions on recidivism. Since the last reports (see Gendreau, Goggin, Cullen, & Andrews, 2000), 39 more effect sizes representing an additional 52,805 offenders were recovered. Their distribution by type of sanction is as follows: more vs. less incarceration (k = 11, n = 38,917), incarceration vs. community (k = 1, n = 1,002), and intermediate sanctions (k = 27, n = 12,886).
Note: k = number of effect sizes per type of sanction; N = total sample size per type of sanction; M = mean phi; CIM = confidence interval about mean phi; z+ = weighted estimation of phi per type of sanction; CIz+ = confidence interval about z+.
a More vs. Less - mean prison time in months: More = 31 mths, Less = 13 mths (k = 202).
b Incarceration vs. Community - mean prison time in months: 10 mths (k = 19).
c Intermediate sanctions = type of sanctions in this category are intensive supervision, arrest, fines, restitution, boot camps, scared straight, drug testing, and electronic monitoring.
|1. Incarceration: More vs. Lessa (233)||107,165||.03||.02 to .05||.03||.02 to .04|
|2. Incarceration vs. Communityb (104)||268,806||.07||.05 to .09||.00||.00 to .00|
|3. Intermediate Sanctionsc (167)||66,500||-.01||-.03 to .01||-.01||-.02 to .00|
|4. Total (504)||442,471||.03||.01 to .04||.00||.00 to .00|
More vs. Less Time in Prison
A total of 26 studies generated 233 effect sizes in this category, with a total sample size of 107,165. The mean length of time incarcerated for the more and less categories (k = 202) was 31 and 13 months, respectively. The majority of the studies in the sample were published (95%), either in journals, texts, or government reports. More than 90% of the effect sizes came from American studies, the majority of which were conducted during the 1970s (82%).
The results indicated no evidence of a punishment effect. Regardless of the choice of effect size (i.e., φ or z+), the longer vs. shorter time period in prison comparison (k = 233) was associated with a small increase in recidivism (φ = .03). Note, neither of the CIs included 0.
Sufficient information was available from 202 more vs. less effect sizes to determine if variations in time served (the difference score in months) were related to recidivism. The results are presented in Table 2. For example, group 4 represents the most severe sanction. There were 47 effect sizes where the difference in time served between the more vs. less group was at least 24 months. The mean effect sizes were .07 and .06 and the CIs did not include 0. From this Table it is clear that increases in recidivism vary by the severity of the sanction as defined by the difference in time served. For the least severe sanction, group 1, small reductions in recidivism were found, although the CIs did include 0. It is also noteworthy that these four groups were markedly similar in regard to the percentage of low and high risk offender effect sizes in each group. Application of the common language effect size statistic (CL) to these results provided an estimate of the magnitude of the effect. We focus on the severest sanction (group 4). That is, the CL indicates that 75% of the time effect sizes in group 4 generated increased estimates of recidivism as compared with those for group 1. The corresponding CL values for group 4 vs. 2 and group 4 vs. 3 are 64% and 55%, respectively.
|Length of Time Incarcerateda (k)||N||M||CIM||z+||CIz+|
Note: The percentage of low risk offender effect sizes in each of the four groups was 38%, 34%, 35%, and 34%, respectively.
a Length of time incarcerated represents the difference in time incarcerated for the offenders in the more vs. less groups.
|1. less than 6 months (37)||8,411||-.03||-.07 to .13||-.01||-.03 to .01|
|2. 7 to 12 months (64)||56,877||.02||.00 to .04||-.02||-.03 to -.01|
|3. 13 to 24 months (54)||14,657||.05||.02 to .09||.03||.01 to .05|
|4. > 24 months (47)||16,327||.07||.04 to .10||.06||.04 to .08|
Incarceration vs. Community-Based
A total of 31 studies met the criteria for inclusion in the incarceration vs. community domain, reporting 104 effect sizes with recidivism (Table 1).
Most of the studies were published (96%), the majority since 1980 (96%), and most of the effect sizes came from American studies (68%). Forty-three percent of comparison groups were regular probation and 35% involved a combination of probation conditions. Incarceration was associated with a slight increase in recidivism (φ = .07, CI = .05 to .09), although when weighted by sample size (z+), the effect was 0.
Combining Incarceration Sanctions
Summing the data for the above incarceration categories (more vs. less and incarceration vs. community) showed that incarceration was associated with a slight increase in recidivism (φ = .04, CI = .03 to .06). When effect sizes were weighted, however, there was no effect (z+ = 00, CI = .00 to .00).
This group included 74 studies that yielded 167 effect sizes from 66,500 offenders (Table 1). The majority of the studies in this sample were published (78%), most in the 1980s (91%) from U.S. sources (80%). Forty-three percent of the control groups employed regular probation, 26% involved no sanction, and 22% consisted of a mixture of various probation conditions.
Intermediate sanctions were associated with a 1% decrease in recidivism and the respective CIs included 0.
Table 3 depicts a large degree of variability in results across the three sanction categories for adults and juveniles. The effect on recidivism was dependent on sanction type and choice of outcome indice (φ or z+).
|1. Incarceration: More vs. Less|
|Adults (228)||68,303||.03||.02 to .05||.03||.02 to .04|
|Juveniles (5)||38,862||.00||-.08 to .08||-.04||-.03 to -.05|
|2. Incarceration vs. Community|
|Adults (71)||76,287||.07||.05 to .10||.03||.02 to .04|
|Juveniles (24)||4,118||.09||.03 to .15||.08||.05 to .11|
|3. Intermediate Sanctions|
|Adults (104)||44,870||-.02||-.05 to .00||-.01||-.02 to .00|
|Juveniles (59)||11,141||.00||-.04 to .04||-.01||-.03 to .01|
|Adults (403)||189,460||.03||.02 to .04||.02||.02 to .02|
|Juveniles (88)||54,121||.02||-.01 to .05||-.02||-.03 to -.01|
Inspection of Table 4 reveals no differential effect of sanctions by gender. With so few effect sizes (n = 10) reported for females, the CIs are relatively wide. Across the three types of sanction categories, there is a tendency for females to be more adversely affected (φ = .08; z+ = .06), although the CIs for males and females do overlap.
|1. Incarceration: More vs. Less|
|Males (211)||99,403||.03||.01 to .04||.00||-.01 to .01|
|Females (7)||563||.15||-.07 to .37||.10||.02 to .18|
|2. Incarceration vs. Community|
|Males (65)||28,622||.06||.03 to .10||.08||.07 to .09|
|3. Intermediate Sanctions|
|Males (115)||48,527||.00||-.03 to .02||.00||-.01 to .01|
|Females (2)||135||-.15||-.63 to .33||-.13||-.30 to .04|
|Males (391)||176,552||.02||.01 to .04||.01||.00 to .02|
|Females (10)||745||.08||-.09 to .24||.06||-.01 to .13|
The data contained in Table 5 is interesting insofar as there is little known about the response of various racial groups to sanctions. The majority of effect sizes came from mixed race samples. In total there were only 5 minority group effect sizes and the respective CIs of both φ and z+ included 0.
|1. Incarceration: More vs. Less|
|White (4)||391||.14||-.12 to .40||.09||-.01 to .19|
|2. Incarceration vs. Community|
|White (9)||2,720||.11||.03 to .19||.10||.06 to .14|
|Minority (3)||852||-.02||-.09 to .04||-.02||-.09 to .05|
|3. Intermediate Sanctions|
|White (29)||4,065||.01||-.06 to .05||-.03||-.06 to .00|
|Minority (2)||450||-.07||-.46 to .33||-.14||-.23 to -.05|
|White (42)||7,176||.03||-.01 to.08||.03||.01 to .05|
|Minority (5)||1,302||-.04||-.09 to .01||.04||-.09 to .01|
Quality of Design
The results in Table 6 bear little relationship to the quality of research design, although in 6 of 8 comparisons involving φ and z+ there was a tendency for effect sizes in the higher quality design condition to be associated with marginally more recidivism. In three of these comparisons, the CIs associated with the stronger design category did not overlap with that of the weaker design group.
|1. Incarceration: More vs. Less|
|Strong (122)||37, 437||.04||.02 to .06||.03||.02 to .04|
|Weak (111)||69,728||.03||.01 to .05||-.01||-.02 to .00|
|2. Incarceration vs. Community|
|Strong (39)||28,456||.11||.01 to .14||.08||.07 to .09|
|Weak (65)||240,350||.04||.01 to .07||-.01||-.01 to -.01|
|3. Intermediate Sanctions|
|Strong (82)||31,903||-.02||-.05 to .00||-.01||-.02 to .00|
|Weak (85)||34,597||.00||-.04 to .03||.00||-.01 to .01|
|Strong (243)||97,796||.03||.01 to.04||.03||.02 to .04|
|Weak (261)||344,675||.02||.01 to .04||-.01||-.01 to -.01|
The results presented in Table 7 suggest no differential association between risk level and type of sanction in its effect on recidivism. All CIs include 0.
|1. Incarceration: More vs. Less|
|Low Risk (79)||58,112||.04||.01 to .06||-.01||-.02 to .00|
|High Risk (139)||44,415||.03||.01 to .05||.02||.01 to .03|
|2. Incarceration vs. Community|
|Low Risk (25)||88,140||.07||.01 to .14||.01||.00 to .02|
|High Risk (70)||168,120||.07||.05 to .10||.00||.00 to .00|
|3. Intermediate Sanctions|
|Low Risk (49)||16,136||.00||-.04 to .04||-.02||-.04 to .00|
|High Risk (110)||8,680||-.01||-.04 to .01||.00||-.02 to .02|
|Low Risk (153)||162,388||.03||.01 to.05||.00||.00 to .00|
|High Risk (319)||253,209||.02||.01 to .04||.00||.00 to .00|
Non-Independence of Effect Sizes
The incarceration dataset herein included a number of studies that produced multiple effect sizes. As a case in point, one study reported the effects of varying lengths of incarceration across 9 risk levels, producing 6 possible effect sizes for each level of risk. Had we applied more stringent selection criteria (i.e., including only comparisons with no overlap in time served), only two of the possible effect sizes would have been eligible. In order to test the possible effects of non-independence on the results, a re-analysis of the data using the aforementioned selection parameters was performed.
For the more vs. less incarceration category, the results were as follows: redundancies included (k = 202, n = 62,420, φ = .03, CI = .01 to .04) and redundancies excluded (k = 69, n = 21,409, φ = .02, CI = -.03 to .05. Under both conditions, the mean z+ was .03. A similar pattern of results applied to the incarceration vs. community-based category: redundancies included (k = 64, n = 68,554, φ = .07, CI = .04 to .10) and redundancies excluded (k = 23, n = 20,356, φ = .08, CI = .07 to .13). In each case, the z+ mean effect size was .03.
Some important caveats should be noted regarding the quality of the research literature in this meta-analysis, particularly in the case of the two prison sanction groups. The studies were bereft of essential information regarding their "personality" (Lipsey & Wilson, 2001). Important sample and methodological descriptors were frequently missing. This is not unusual when dealing with prison-based studies (Gendreau, Goggin, & Law, 1997). For example, no study recorded any information about the conditions of confinement, an absolutely critical component. The exact length of time confined was not precisely defined in many of the more vs. less incarceration studies and was unreported in 86% of the incarceration vs. community effect sizes. Part of the problem (and this is being charitable) rests in the fact that few studies were specifically designed to test a deterrence hypothesis. They were examining parole issues where, fortuitously for our purposes, the studies recorded varying lengths of time served (with risk control comparisons) or they were intermediate sanction studies that had, as their comparison groups, offenders who served time in prison.Footnote 7 Some of the studies were quite dated, which, in itself, does not invalidate their contributions, but does speak to the unfortunate lack of contemporary studies given the ubiquitous use of prison as a control agent. Finally, some studies produced a disproportionate number of effect sizes – particularly in the case of the prison more vs. less category – which tends to limit generalizability (e.g., Gendreau et al., 1997).
Nevertheless, this database, imperfect as it may be, is the best there is to date if policy makers wish to entertain a serious discussion about the utility of prisons and intermediate sanctions as effective punishers. The three major categories of sanctions we investigated were based on huge datasets and were consistent in producing results unassociated with reductions in recidivism. We are confident that, no matter how many studies are subsequently found,Footnote 8 sanction studies will not produce results indicative of even modest suppression effects or results remotely approximating outcomes reported for certain types of treatment programs (φ = .26, CI = .21 - .31; Andrews, Dowden, & Gendreau, 2002). As to the second focus of this investigation, there were no differential effects of sanctions reported for juveniles, females, or minority groups or for high vs. low risk offenders. Two cautions are warranted; the database for minorities is minuscule and there is a tentative indication that sanctions may affect females more adversely than males.
On the other side of the coin, "get tough" aficionados might cavil about the research design quality of the prison studies but the reality is that proponents of such sanctions have long rested their case on far less substantive foundations; common sense arguments and narrative reviews.Footnote 9 One cannot imagine, however, criminal justice systems suddenly embarking upon a number of randomized designs for the benefit of meta-analysts. Thus, we are left with a collection of comparison group studies of varying quality for policy makers to ruminate over. What does one make of these? It is a complex issue. Several meta-analysts have suggested that good comparison group designs produce results similar to those of true experimental designs (c.f., Andrews et al., 1990; Heinsman & Shadish, 1996; Lipsey & Wilson, 1993; Shadish & Ragsdale, 1996) while others find more stringent study designs are associated with effects of less magnitude (Weisburd, Lum, & Petrosino, 2001).Footnote 10
In our opinion, effect sizes from studies of better design quality within the prison sanctions categories were informative given that the experimental and comparison groups were comparable on at least 5 important risk factors (i.e., criminal history) and many of the comparisons were based on validated risk measures. The results from these studies did not support the deterrence perspective. Two effect sizes, by the way, came from randomized designs; they reported 5% and 9% increases in recidivism for the incarceration group (the intermediate sanctions literature was of generally higher quality).
But even more important than considerations of design issues is the paramount fact that there is absolutely no cogent theoretical or empirical rationale for criminal justice sanctions to suppress criminal behaviour in the first place (Gendreau, 1996). At best, most criminal justice sanctions are threats (e.g., "do something unspecified sometime in the future and something may happen"). To those who believe that criminal justice sanctions in general or threats in particular are effective punishers or negative reinforcers, we advise they consult the relevant behaviour modification literature or any experimental learning text for supportive evidence (e.g., Masters, Burish, Hollon, & Rimm, 1987). There is none.
The results forthcoming from the more vs. less prison category deserves more comment, where, overall, a criminogenic effect was found whether effect sizes were weighted or not. Moreover, stronger criminogenic effects were found for greater differences in time served (Table 2). These results appear to give some credence to the prison as "schools of crime" perspective given that the proportion of low risk offender effect sizes in each category in this particular analysis were very similar.Footnote 11 Even though the CIs for both φ and z+ did not include 0 in many of these comparisons, such marginal results may only be indicative of Paul Meehl's infamous crud factor (Meehl, 1991). With these huge sample sizes, achieving statistical significance is of questionable import. One should be mindful, however, that if further research consistently supports findings of slight increases in recidivism then the enormous costs accruing from the excessive use of prison may not be defensible. Percentage changes of as "little" as several percent have resulted in significant cost implications in medicine and other areas of human services (Hunt, 1997). Furthermore, in the criminal justice field it is estimated that the criminal career of just one high-risk offender "costs" at least $1,000,000 (Cohen, 1998; see Cullen & Gendreau, 2000). Arguably, increases in recidivism of even a modest amount are fiscally irresponsible, especially given the high incarceration rates currently in vogue in North America.
Our concluding observation is this. While this study produced worthwhile information from a clinical and policy perspective, we have to move beyond analyses such as this one. This is not necessarily a criticism of meta-analysis, but it is a blunt instrument when the studies involved are so uninformative about essential study features that there is no recourse but to generate better primary studies at the individual level. We must, instead begin to engage in more sensitive evaluations, particularly in the case of the effects of incarceration. Evaluators, in concert with prison authorities, must carefully examine what goes on inside the "black box" of prison life, a topic we need to know much more about (Bonta & Gendreau, 1990; Gendreau & Keyes, 2001). It should be mandatory that periodic assessments of offenders' adjustment are conducted every six months to a year on a wide variety of dynamic risk factors. Assessments of incarcerates' changes in behaviour (e.g., attitudes, beliefs, employment/academic performance, treatment program performance, misconducts, etc.) and their relationship to recidivism will uncover who may benefit or be harmed by prison life and by how much. Secondly, there should be assessments of how situational factors (e.g., inmate turnover, availability of treatment and work programs, staff/inmate relations, institutional climate) affect prisoners' adjustment (Bonta & Gendreau, 1990; Gendreau et al., 1997). Thirdly, we must be mindful of how offender characteristics and prison situations interact (Bonta & Gendreau, 1993). Only then will we address the controversial issue of the effects of prisons on recidivism in a much more adequate manner. At present, we are embarking upon a research program to address some of these issues in a series of primary studies which should offer a much more precise estimate of the effects of prisons on recidivism.
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Zamble, E., & Porporino, F. J. (1988). Coping behavior and adaptation in prison inmates. New York, NY: Spring-Verlag.
4 conference paper
Decade of Publication
4 New Zealand
1 adult (>80%)
2 juvenile (>80%)
3 mixed (20% - 80%)
1 male (>80%)
2 female (>80%)
3 mixed (20% - 80%)
1 white (>80%)
2 minority (>80%)
3 mixed (20% - 80%)
3 midpoint on risk scale
1 uses valid psychometric
2 uses demographic information, <2 priors
3 uses recidivism %
Employment of Evaluator
Involvement of Evaluator
Theory/Practice of Punishment
1 6 months - 1 year
2 1 year - 3 years
3 3 years or more
1 less prison
3 regular probation
6 no sanction
LOS Incarceration (months)
LOS Sanction (months)
Experimental treatment time (months)
Control treatment time (months)
Rx Difference1 (months)
1 <9 months
2 10 - 19 months
3 >20 months
LOS Rx (months)
4 parole violation
5 contact with the court
2 Scared Straight
4 incarceration: more versus less
5 incarceration versus community-based sanction
6 boot camp versus community-based sanction
7 electronic monitoring
8 drug testing
Recidivism: % Treatment
Recidivism: % Control
Direction of Predictor
1 equal recidivism rates
2 experimental > control
3 experimental < control
One perspective on common sense that has stood the test of time and is congruent with current social psychological research is that espoused by Francis Bacon. The crux of his view is that people adopt beliefs which satisfy their prejudice or the fashionable ideologies of the time. Information that is contradictory is ignored or facile distinctions are made to preserve one's existing belief systems (see Gendreau, Goggin, Cullen, & Paparozzi, in press). Indeed, Bacon's view is that common sense beliefs are founded in superstition.
There are theoretical perspectives from the criminological and psychological (e.g., operant learning, punishment, social psychology) fields that counter a punishment hypothesis. For a comprehensive review, consult Gendreau et al., (1999).
It was impossible to determine the therapeutic integrity of the treatments included in these programs. In our estimation, most were sadly lacking in this regard.
The effects of individual differences in offenders (e.g., IQ, psychopathy) in response to punishment has been studied but usually in artificial laboratory settings (Gendreau & Suboski, 1971a, b). It is how punishers - those whose effectiveness has been empirically demonstrated - are administered that is of utmost importance.
The reporting of essential study descriptors in this literature is, with few exceptions, so inadequate that only a handful of variables are available for coding, and even then difficulties arise (e.g., risk level; see Gendreau et al., 1999).
There are contrary views in the literature. Leschied and Gendreau (1994) contend that low risk offenders should be adversely affected by incarceration while Zamble and Porporino (1988) imply the opposite.
This is an interesting choice as one would think such studies would have as comparison groups offenders who only received a less severe sanction than prison.
Recent meta-analyses on sub-components of this database - boot camps and restitution (Latimer, Dowden, & Muise, 2001; MacKenzie, Wilson, & Kider, 2001) - have reported very similar results to our own using expanded databases. The above reports found that boot camps had negligible effects on recidivism while restitution produced slight reductions (about 5%), an effect which we opine is probably due to treatment being imbedded in the design of these programs.
Narrative reviews are next to useless in determining precise effects with large databases (Gendreau et al., 2000). A good example (and this is not a criticism, the authors were unbiased and doing the best they could with a small database reporting inconsistent results) was Song and Lieb's (1993) attempt to estimate the effects of prison on recidivism.
Our guess (see also Weisburd et al., 2001) is that future analyses will find results vary substantially by design quality for specific literatures. Furthermore, within correctional treatment literatures, we predict that the therapeutic integrity of treatment programs (as measured by a quantitative instrument such as the Correctional Program Assessment Inventory - CPAI 2000, Gendreau & Andrews, 2001) will be a more powerful determinant of treatment outcomes than whether the evaluations were based on a randomized or a good quasi-experimental design. It is our intention to examine this issue in the future.
This is not necessarily a surprising result. We speculate that most sentencing decisions reflect the seriousness of the offense (a weak predictor of recidivism) as well as other factors germane to the courts. To our knowledge, the courts have often been reluctant to consider risk assessments, particularly those involving dynamic risk factors, in sentencing. In addition, many of the studies available to this analysis were produced many years ago when comprehensive risk assessments were rare.
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