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successfill discharges only), the effect of TC was non-significant, although inmates in the
Comparison group were 1.2 times as likely as to relapse as TC graduates.
We again entered a categorical variable that reflected the effect of institutional setting (see
Model 2 in both Tables 25 and 26). This time, controlling for other variables such as age, criminal
history and level of need for treatment, treatment effects depended on the institutional setting.
Inmates at Cresson and Houtzdale had a significantly higher rate of drug relapse than inmates
treated at the other three institutions. This effect held constant regardless of whether we examined
all releasees or only the subsample that successfillly completed their treatment program
Examining the log-odds ratios reported in Tables 25 and 26, we see that Inmates at Cresson and
Houtzdale were 2.7 - 2.9 times as likely to relapse as other inmates in the sample.
e
We then added employment status to logistic regressions, examining all other variables as
control variables (e.g., inmate drug scores, criminal history scores, TC v. Comparison group,
institutional setting). The results are shown in Model 3 of Tables 25 and 26. Fulltime employment
status was strongly related to drug relapse. Those employed full time were only half as likely to
relapse as other parolees, regardless of whether we examined all releasees (Table 25) or
successful graduates only (Table 26). The effect for “Unemployed but Able” was significant for
the sample of all releasees (Table 25), but non-significant for successful treatment graduates only
(Table 26).
Finally, using estimated probabilities obtained fiom the logistic regression analyses, we
examined relapse rates for the two groups controlling for all other variables entered into the
equation (see Figures 6 through 8).
inmates who were deceased, now serving a previous sentence, or those simply given an
administrative transfer).
115
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been published by the Department. Opinions or points of view expressed are those of the author(s)
and do not necessarily reflect the official position or policies of the U.S. Department of Justice.