Actuarial Assessment of Sex Offender Recidivism Risk: A Cross-Validation of the RRASOR and the Static-99 in Sweden

We cross-validated two actuarial risk assessment tools, the RRASOR (R. K. Hanson, 1997) and the Static-99 (R. K. Hanson & D. Thornton, 1999), in a retrospective follow-up (mean follow-up time = 3.69 years) of all sex offenders released from Swedish prisons during 1993–1997 (N = 1,400, all men, age 18 years). File-based data were collected by a researcher blind to the outcome (registered criminal recidivism), and individual risk factors as well as complete instrument characteristics were explored. Both the RRASOR and the Static-99 showed similar and moderate predictive accuracy for sexual reconvictions whereas the Static-99 exhibited a significantly higher accuracy for the prediction of any violent recidivism as compared to the RRASOR. Although particularly the Static-99 proved moderately robust as an actuarial measure of recidivism risk among sexual offenders in Sweden, both procedures may need further evaluation, for example, with sex offender subpopulations differing ethnically or with respect to offense characteristics. The usefulness of actuarial methods for the assessment of sex offender recidivism risk is discussed in the context of current practice.     

Actuarial risk assessment and recidivism in a sample of UK intellectually disabled sexual offenders

Abstract

This study examines the effectiveness of three risk assessment instruments: Static-99, Risk Matrix 2000 (RM2000) and the Rapid Risk of Sex Offender Recidivism (RRASOR), in predicting sexual recidivism among 27 intellectually disabled sex offenders. The overall sexual offence reconviction rate was 30%, while non-recidivists remained offence-free over 76 months of follow-up. Static-99 presented as performing as well as guided clinical judgements in mainstream population studies [area under the curve (AUC)=0.64] exceeding the performance of RM2000 (AUC=0.58) in predicting sexual recidivism. However, the results were not statistically significant. In contrast to previous findings, the RRASOR presented the worst level of prediction (AUC=0.42). These results highlight the need to investigate further with larger sample sizes and in conjunction with more dynamic measures of risk. Proposed relevant factors are discussed in detail.     

Differences in the predictive validity of actuarial risk assessments in relation to sex offender type

This study seeks to expand on the previously reported validity of the Static-99, RRASOR, MnSOST-R, and SORAG in predicting sexual recidivism utilizing a regional sample of offenders. The predictive validity of each test was determined utilizing subgroups of the sample based on each offender's known offense history. The effectiveness of each instrument varied depending on offender type. The Static-99 and SORAG were both significantly predictive of sexual, violent, and any recidivism for extra-familial child molesters, and all four tests were predictive of violent or any recidivism in this subgroup. For incest offenders, all four tests were at least moderately predictive of sexual recidivism, whereas the Static-99 and the SORAG were highly predictive of violent or any recidivism. None of the four tests established consistent predictive validity across recidivism categories in regard to rapists or hands-off offenders, however, the Static-99 and the SORAG were significant in terms of sexual recidivism.     

Predicting Recidivism Amongst Sexual Offenders: A Multi-site Study of Static-2002

The predictive accuracy of Static-2002 (Hanson & Thornton, Notes on the development of Static-2002 (Corrections Research User Report No. 2003-01), 2003) was examined in eight samples of sexual offenders (five Canadian, one U.S., one U.K., one Danish; total sample of 3,034). Static-2002 showed moderate ability to rank order the risk for sexual, violent and general (any) recidivism (AUCs of .68, .71, and .70, respectively), and was more accurate than Static-99. These findings support the use of Static-2002 in applied assessments. There were substantial differences across samples, however, in the observed sexual recidivism rates. These differences present new challenges to evaluators wishing to use actuarial risk scores to estimate absolute recidivism rates.     

Comparing sex offender risk assessment measures on a UK sample

The purpose of this study on 139 sex offenders was to consider the application of six measures of risk: Static-99, SACJ-Min (Structured Anchored Clinical Judgment Scale-Minimum), RRASOR (Rapid Risk Assessment for Sexual Offence Recidivism), Risk Matrix 2000-Sexual/Violent, and SVR-20 (Sexual Violence Risk-20) and to compare risk assessments conducted by a Regional Secure Unit (RSU) and the Probation Service. Levels of risk for the RSU sample ranged from 1% to 42% low risk to 1% to 66% high risk compared with the Probation sample of 8% to 43% low risk to 4% to 70% high risk. Offenders with adult victims obtained significantly higher scores using the RM2000/S and SACJ-Min than did those with child victims who obtained significantly higher scores on the RRASOR. Sex offenders referred to a RSU scored significantly higher on RRASOR and RM2000/S than did sex offenders supervised by the Probation Service. Forensic practitioners may be better served if risk measures assess specific subcategories of sexual offenders.     

Application of operational psychology to assessment of inmates

Abstract

The newly developed actuarial risk instruments, Static-2002 (Hanson & Thornton, 2003a) and Risk Matrix 2000 (RM2000) (Thornton et al., 2003), were cross-validated and compared with Static-99 (Hanson & Thornton, 2000) in a retrospective follow-up study of 304 forensic psychiatrically evaluated sexual offenders (mean time-at-risk=14.8 years). All instruments predicted any sexual, non-sexual violent and any violent recidivism moderately for child molesters [area under the curve (AUC) of the receiver operating characteristic (ROC)=0.67 (95% CI=0.57–0.77) to 0.76 (95% CI=0.68–0.85)] but poorly for rapists [AUCs=0.64 (95% CI=0.51–0.70) to 0.68 (95% CI=0.59–0.77)]. The instruments also predicted severe sexual recidivism moderately for child molesters [AUCs=0.74 (95% CI=0.63–0.86) to 0.79 (95% CI=0.70–0.89)] but were of no value in informing on this outcome for rapists [AUCs=0.58 (95% CI=0.47–0.68) to 0.63 (95% CI=0.53–0.73)]. AUC estimates were generally higher for Static-2002 and RM2000 than for Static-99, but no single instrument demonstrated statistical superiority. The study provides support for implementing actuarial instruments in applied risk assessments of child molesters.     

Accuracy of the static-99 in predicting recidivism in Switzerland

The Static-99 is a widely used actuarial risk assessment instrument. Various international validation studies have found satisfactory to good predictive validity for the Static-99, with the area under the curve (AUC) between 59% and 95%. This study is the first evaluation of the predictive accuracy of the Static-99 among sex offenders in Switzerland. The Static-99 scores of 69 violent/sex offenders in Switzerland were assessed using data from their psychiatric assessments. Recidivism was operationalized as reconviction assessed from penal records. The Static-99 risk levels were predictive for recidivism (AUC = .758) among our population. The results are discussed on the basis of the literature.     

The significance of offending behavior for predicting sexual recidivism among sex offenders of various age groups

Based on a sample of 682 male sex offenders, this study investigated variables of the offending behavior for predicting sexual recidivism in different age groups. The sex offenders were allocated into four age groups. For each group, those characteristics of offending behavior showing a significant bivariate correlation with sexual recidivism were extracted. Using logistic regression, we then analyzed their incremental validity above and beyond a previously developed Crime Scene Behavior Risk (CBR)-Score, which measures the risk of sexual recidivism without taking into account the offenders' age (Dahle, Biedermann, Gallasch-Nemitz, & Janka, 2010). Age-specific offending behavior variables with incremental validity were combined with the general CBR-Score into age-specific scores and examined for their predictive accuracy. We also analyzed the extent in which these age-specific scores showed incremental validity above and beyond the Static-99 (Hanson & Thornton, 1999). For three of the four age groups, age-specific Crime Scene Behavior Risk-Scores could be determined which were incrementally valid above and beyond the Static-99. Predictive accuracy varied between AUC=.74 and AUC=.90 (r=.28 to r=.49) depending on age group. The results are discussed within context of recent findings on the latent dimensions of actuarial risk assessment variables.     

Cross-validation of the risk matrix 2000 sexual and violent scales

The predictive accuracy of the newly developed actuarial risk measures Risk Matrix 2000 Sexual/Violence (RMS, RMV) were cross validated and compared with two risk assessment measures (SVR-20 and Static-99) in a sample of sexual (n= 85) and nonsex violent (n= 46) offenders. The sexual offense reconviction rate for the sex offender group was 18% at 10 years follow-up, compared with 2% for the violent offenders. Survival analyses revealed the violent offenders were reconvicted at twice the rate compared to sexual offenders. The RMV significantly predicted violent recidivism in the sex and combined sex/violent offender groups. Although the RMS obtained marginal accuracy in predicting sexual reconviction in the sex offender group, none of the scales significantly predicted sexual reconviction. An item analysis revealed four factors not included in the risk scales that were significantly correlated with sexual and violent reconviction. Combining these factors with Static-99, RMV, and RMS increased the accuracy in predicting sexual reconviction.     

Predictive Validity of the SVR-20 and Static-99 in a Dutch Sample of Treated Sex Offenders

In this retrospective study, the interrater reliability and predictive validity of 2 risk assessment instruments for sexual violence are presented. The SVR-20, an instrument for structured professional judgment, and the Static-99, an actuarial risk assessment instrument, were coded from file information of 122 sex offenders who were admitted to a Dutch forensic psychiatric hospital between 1974 and 1996 (average follow-up period 140 months). Recidivism data (reconvictions) from the Ministry of Justice were related to the risk assessments. The base rate for sexual recidivism was 39%, for nonsexual violent offenses 46%, and for general offenses 74%. Predictive validity of the SVR-20 was good (total score: r = .50, AUC = .80; final risk judgment: r = .60, AUC = .83), of the Static-99 moderate (total score: r = .38, AUC =.71; risk category: r = .30, AUC = .66). The SVR-20 final risk judgment was a significantly better predictor of sexual recidivism than the Static-99 risk category.     

The Static-99R predicts sexual and violent recidivism for individuals with low intellectual functioning*

A current debate is whether actuarial risk assessment tools predict sexual recidivism in sexual offenders with intellectual disabilities (SOIDs). Since intellectual functioning exists on a spectrum, the present study examined the predictive validity of the Static-99R across the range of intellectual functioning. The sample was comprised of 454 adult sexual offenders assessed at an outpatient clinic and followed for an average of 10 years. Offenders in the extremely low/borderline group had higher scores on the Static-99R than other offenders, largely due to their score on the detachment subscale of the Static-99R, but did not have significantly higher recidivism rates. Calibration analyses suggested that the expected and observed recidivism rates did not differ significantly. Intellectual functioning did not add incremental validity to the Static-99R. Further, there was no interaction between intellectual functioning and actuarial risk score. The results suggested that the Static-99R can be used across the range of intellectual functioning, albeit somewhat more cautiously for those at the lowest and highest end of the intellectual functioning distribution.     

Can we keep it simple? Using the BARR-2002R with a community-based sex offender sample

The Brief Assessment of Recidivism Risk (BARR-2002R) comprises of six items from the Static-2002R and has been designed for predicting general and violent recidivism among sexual offenders. The present study investigates the ability of the BARR-2002R, Static-2002R, Static-99R, and SORAG to predict general, violent, and sexual recidivism in a sample of 342 male sex offenders at a community-based forensic clinic. All four of the risk schemes demonstrated large effect sizes for predicting general, violent, and sexual recidivism, although the BARR-2002R produced a moderate effect size in its prediction of sexual reoffending. Unlike past research, the BARR-2002R did not outperform the other measures; however, our findings showed that the BARR-2002R adds incremental value to the Static-99R in predicting general and violent recidivism. These findings provide support that the BARR-2002R is a valid, abbreviated risk scheme that could be used in routine assessments of individuals convicted of sexual offending.     

Static risk factors predict sexual misconduct among incarcerated female sexual offenders

Abstract

Although there has been a great deal of research conducted on sexual offenders in recent years, the vast majority of studies have focused on male perpetrators. Little is known about female sexual perpetrators, due primarily to the small number of offenders/offences and sociocultural factors. This study evaluated if there was an association between static risk factors [as delineated by the Static-99 and Rapid Risk Assessment for Sex Offender Recidivism (RRASOR)] and institutional sexual misconduct for incarcerated female sexual offenders. In addition to demographic information, total Static scores were obtained from a file review along with institutional conduct reports. The STATIC-99 and RRASOR scores from intake information significantly predicted sexual conduct reports in prison.     

Some notes on the validation of VRS-SO static scores

ABSTRACT

The present study was a psychometric examination of Violence Risk Scale-Sexual Offender version (VRS-SO; Wong, S., Olver, M. E., Nicholaichuk, T. P., & Gordon, A. (2003 Wong, S., Olver, M. E., Nicholaichuk, T. P., & Gordon, A. (2003). The violence risk scale: Sexual offender version (VRS-SO). Saskatoon: Regional Psychiatric Centre and University of Saskatchewan. [Google Scholar]). The violence risk scale: Sexual offender version (VRS-SO). Saskatoon: Regional Psychiatric Centre and University of Saskatchewan) static item scores in a Canadian multisite sample of 668 treated adult male sexual offenders. Exploratory factor analysis (EFA) of 13 nonredundant Static-99R and VRS-SO static items generated three factors labelled Youthful Aggression, Sexual Criminality, and General Criminality. The factor and total scores converged with Static-99R and VRS-SO dynamic factor scores. Scores on the VRS-SO static items, EFA-derived factors, and total score each significantly predicted 5- and 10-year sexual, violent, and general recidivism through ROC analyses. Cox regression survival analyses showed all three factors uniquely predicted sexual recidivism to varying degrees in the overall sample; however, only Youthful Aggression and General Criminality uniquely significantly predicted violent and general recidivism in the overall sample and among sexual offender subgroups. Implications for theory, clinical practice, and instrument refinement are discussed.     

Prospective Replication of the Violence Risk Appraisal Guide in Predicting Violent Recidivism Among Forensic Patients

An exhaustive survey of a cohort of forensic patients provided an opportunity for a prospective replication of the predictive accuracy of the Violence Risk Appraisal Guide (VRAG). Data collected during the original survey also permitted a test of the predictive accuracy of clinical assessments of risk on the same cohort. The VRAG yielded a large effect size in predicting violent recidivism (ROC area = .80) over a constant 5-year follow-up and performed significantly better than averaged clinical opinions. The superiority of the VRAG was also observed at very short follow-up times and for very serious violence. Moreover, for 16 subsamples, observed rates of violent recidivism did not differ significantly from the expected rates. VRAG score was unrelated, and clinical judgments inversely related to violent recidivism in the small low-risk sample of female forensic patients. The authors conclude that, regardless of length of opportunity or severity of outcome, actuarial methods are more accurate than is clinical judgment.     

Violent and sexual offences: a validation of the predictive quality of the PCL:SV in Switzerland

Used to diagnose psychopathy, the Psychopathy Checklist: Screening Version (PCL:SV) is still rarely used in the German-speaking part of Europe. The aim of the present study was to conduct a first-time evaluation of the predictive validity of the PCL:SV for sexual and violent recidivism in the German language area. PCL:SV scores for 96 violent and sexual offenders in Switzerland were assessed. These assessments were based on data taken from the forensic psychiatric expert opinions. The scores were then compared to subsequent recidivism as shown in the official criminal records. ROC analysis indicated a cut-off score of 14 for maximized overall predictive accuracy. Consistent with various results from past research in North America and Europe, the PCL:SV yielded a satisfying predictive accuracy (ROC area=.69). This degree of accuracy demonstrates the PCL:SV's usefulness for risk assessment of sexual and violent delinquency in the Swiss cultural and German language area.     

Prediction of violent and sexual offences: A replication study of the VRAG in Switzerland

Abstract

The Violence Risk Appraisal Guide (VRAG) is a widely used actuarial risk assessment instrument and has been validated in different countries. However, there is no investigation supporting the predictive accuracy of the VRAG in the German language area. The VRAG scores of 79 violent and sexual offenders in Switzerland were assessed based on data from their psychiatric expert opinions. The VRAG scores were compared to subsequent recidivism as shown in the official criminal records. Consistent with past research in the English language area, the VRAG yielded a satisfying predictive accuracy (ROC area = .73), demonstrating its usefulness for risk assessment of violent delinquency in the Swiss cultural and German language area.     

Sex Offenders of East Asian Heritage Resemble Other Canadian Sex Offenders

Although there is considerable research on Caucasian sexual offenders, there has been much less research on sex offenders of Asian heritage. The current study compared East Asian (e.g., Chinese, Japanese, and Korean) sex offenders in British Columbia (B.C.), Canada, and other B.C. sex offenders on items and total score of Static-99R. This study included all provincially sentenced adult male sexual offenders (n = 4580) supervised in the community by B. C. Corrections (including 122 East Asian sex offenders). Sexual, violent, any crime, and any recidivism (including technical violations) data were collected with an average follow-up 4.3 years. The total scores of Static-99R were similar between East Asian sex offenders and other ethnic groups (M = 2.0 vs. M = 2.4). East Asian offenders scored significantly lower than other ethnic offenders on several items measuring general criminality (e.g., prior non-sexual violence, prior sentencing dates, and any prior sex offenses). In contrast, Asian offenders appeared to be more paraphilic (e.g., any convictions for non-contact sex offenses). Lastly, Static-99R significantly predicts sexual, violent, and criminal among sex offenders of East Asian heritage.     

Socially desirable responding and psychometric assessment of dynamic risk in sexual offenders against children

Does socially desirable responding (SDR) represent a threat to the validity of dynamic risk assessment in sex offenders’ self-reports? We studied a sample of men (N?=?218) who completed a psychometric assessment battery while enrolled at Kia Marama, a prison-based treatment program for sexual offenders against children. SDR, as measured by the Marlowe-Crowne scale, was elevated compared to non-offender samples, increased from pre- to post-treatment, and was negatively correlated with dynamic risk (rs?=??.30 to ?.40), consistent with previous research. Measures of dynamic risk factors derived from the psychometric battery were correlated with sexual recidivism, but correlations were little changed when variance associated with SDR was removed using a regression procedure [Mills, J. F., &; Kroner, D. G. (2006). Impression management and self-report among violent offenders. Journal of Interpersonal Violence, 21(2), 178–192.]. These results suggest that there is a substantial component of the variance in psychometric self-reports of sexual offenders that is associated with SDR (approximately 10%), but that it does not compromise the predictive or construct validity of dynamic risk measures derived from these reports.     

How nonrecidivism affects predictive accuracy: evidence from a cross-validation of the Ontario Domestic Assault Risk Assessment (ODARA)

Prediction effect sizes such as ROC area are important for demonstrating a risk assessment's generalizability and utility. How a study defines recidivism might affect predictive accuracy. Nonrecidivism is problematic when predicting specialized violence (e.g., domestic violence). The present study cross-validates the ability of the Ontario Domestic Assault Risk Assessment (ODARA) to distinguish subsequent recidivists and nonrecidivists among 391 new cases with less extensive criminal records than previous cross-validation samples, base rate=27%, ROC area=.67. Excluding ambiguous nonrecidivists increases the base rate to 33%, ROC area=.74. Random samples of 50 recidivists and 50 unambiguous nonrecidivists yield ROC areas from .71 to .80. Published norms significantly underestimate official recidivism. Ambiguous nonrecidivism is prevalent and leads to underestimating base rates and predictive accuracy.