Table 2.
Treatment Outcome of Opioid Use Groups
| Characteristic | Prescription-opioid-only users | Heroin-only users | Heroin-and-prescription-opioid users | P value* |
|---|---|---|---|---|
| Treatment outcome | ||||
| Treatment completion, % (n) | 59 (17) | 30 (37) | 38 (18) | .01† |
| Retention, mean no. of weeks (SD) | 21.0 (6.7) | 14.2 (9.5) | 18.9 (6.7) | .002†, ‡ |
| Percent opioid-negative urines with missing counted as positive, mean (SD) | 56.3 (33.0) | 39.8 (36.2) | 35.3 (30.2) | .03†, § |
| Percent opioid-negative urines of samples collected, mean (SD) | 75.3 (33.1) | 52.9 (39.0) | 48.8 (33.9) | .007†, § |
| Weeks of cont. opioid abstinence, mean (SD) | 8.2 (6.2) | 5.9 (6.6) | 4.5 (4.8) | .04§ |
| Percent cocaine-negative urines with missing counted as positive, mean (SD) | 55.5 (32.5) | 46.5 (36.8) | 45.5 (31.2) | .42 |
| Percent cocaine-negative urines of samples collected, mean (SD) | 79.7 (32.4) | 72.9 (33.6) | 69.4 (31.7) | .43 |
| Weeks of cont. cocaine abstinence, mean (SD) | 7.4 (7.6) | 8.7 (6.8) | 6.8 (6.0) | .55 |
*Based on logistic regression for categorical variables and one-way ANCOVA for continuous measures controlling for assigned treatment group
†Heroin-only users ≠ prescription-opioid-only users.
‡Heroin-only users ≠ heroin-and-prescription-opioid users.
§Prescription-opioid-only users ≠ heroin-and-prescription-opioid users.