Table 3. Interaction Between Prior Substance Use Disorder Treatment and Study Group on the Risk of Enrollment in Substance Use Disorder Program Within 30 Days of Enrollment in the Triala.
| Study group | No prior treatment exposure | Prior treatment exposure | Prior treatment exposure (yes vs no) within strata of study groups, RR (95% CI) | P value | ||||
|---|---|---|---|---|---|---|---|---|
| No. enrolled in SUD program (yes/no) | RR (95% CI) | P value | No. enrolled in SUD program (yes/no) | RR (95% CI) | P value | |||
| Social worker | 53/185 | 1 [Reference] | NA | 45/42 | 2.31 (1.69-3.16) | <.001 | 2.31 (1.69-3.16) | <.001 |
| Peer | 52/182 | 1.00 (0.71-1.40) | >.99 | 51/38 | 2.51 (1.86-3.39) | <.001 | 2.51 (1.86-3.40) | <.001 |
| Study groups (peer vs social worker) within strata of prior treatment exposure, RR (95% CI) | NA | 1.00 (0.71-1.40) | >.99 | NA | 1.09 (0.83-1.42) | .55 | NA | NA |
Abbreviations: NA, not applicable; RR, relative risk; SUD, substance use disorder.
a
Log binomial regression models adjusted for the following randomization blocking variables: age category (<50 years), sex at birth, and hospital site.