Study
Van Voorhis and colleagues (2002) conducted the Phase II evaluation, which expands upon the Phase I evaluation by using a larger study sample across a larger number of parole districts in Georgia. The sample included individuals who completed the program from July 1998 to April 2000. Phase II focuses on the conditions under which CST is most beneficial to participants. A randomized experiment was conducted in which 963 male parolees from 25 parole districts were randomly assigned to the CST (n = 470) or the control group (n = 493).
The treatment group was 69.3 percent nonwhite and 30.7 percent white. The average age was 31.9 years, and the average number of prior incarcerations was 1.8. The comparison group was 71 percent nonwhite and 29 percent white. The average age was 31.9 years, and the average number of prior incarcerations was 2. No significant differences were observed between the two groups on a variety of demographic, socioeconomic, and criminal history variables. The study examined both employment and recidivism outcomes.
Recidivism was measured in three ways: return to prison, felony arrest or parole revocation, and technical parole violation. Employment was measured by whether the individual was employed either full- or part-time. For the felony arrest/revocation, technical violation, and employment, outcomes were tracked for 12 months after the program end date. For return to prison, outcomes were tracked for variable time periods ranging from 12 months to up to 33 months after the program end date.
Administrative data from the state’s offender-based tracking system was used. Survival analyses were conducted to determine the effects of the program on return to prison and felony rearrests/revocations while taking into account how long each individual in the study sample was at risk for recidivism.
Study
Van Voorhis and colleagues (2001) used a randomized controlled trial to determine the effect of Cognitive Skills Training (CST) on recidivism and employment measures. The evaluation of CST was completed in two phases. The present summary focuses on Phase I and the Study 2 summary below focuses on Phase 2. The Phase 1 evaluation involved program participants who completed CST by July 1998 while the Phase 2 evaluation involved participants who had completed the program from July 1998 to April 2000.
Male study participants from 16 parole districts in Georgia were randomly assigned to either the treatment (n = 232) or control (n = 236) conditions. The treatment group was 69.4 percent African American and 30.6 percent white, and the average age was 30 years. Most of the treatment sample (71.1 percent) were classified as low risk, with 28.9 percent classified as medium/high risk. The comparison group was 72 percent African American and 28 percent white, and the average age was 30.5 years. Most of the comparison sample (64.4 percent) were classified as low risk, with 35.6 percent classified as medium/high risk. The treatment and comparison groups did not significantly differ on any of the following characteristics: age, race, education, employment status at prison intake, IQ, history of substance abuse, marital status, risk assessment scores, number of prior incarcerations, prior felony convictions, or prior violent offenses.
Recidivism was measured in three ways: return to prison, felony arrest or parole revocation, and technical parole violation. Employment was measured by whether the individual was employed either full- or part-time. Administrative data on returns to prison was gathered from prison records and covered a period of up to 30 months after the program ended. Follow-up forms completed by parole supervisors at 3, 6, and 9 months postrelease were used to assess re-arrest, felony re-arrest/revocation, technical violation, and employment status.
Survival analysis was used, controlling for time at risk of recidivism, to evaluate the cumulative effects of treatment on the proportion of each group that returned to prison, was re-arrested, or whose parole was revoked over the follow-up period. Chi-square tests were used to assess the impact of treatment on technical violations and employment outcomes. A subgroup analysis was conducted to determine if risk status and dosage mediated the effects of the program.