Table 2.
Results from mixed effects regression models predicting changes in Quality of Life scores.
| Physical b (SE) |
Psychological b (SE) |
Social b (SE) |
Environmental b (SE) |
|
|---|---|---|---|---|
|
|
||||
| Treatment Enrollment Status | ||||
| Treatment status (ref= not in treatment) | 3.09 (1.81) | 4.89 (1.62)** | −0.03 (2.25) | 4.94 (1.55)** |
| Opiate Use | ||||
| Days of opiate use, past 30 days | −0.12 (0.07) | −0.22 (0.07)** | −0.16 (0.09) | −0.10 (0.06) |
| Opiate-positive urine test (ref= negative) | 1.54 (1.32) | −0.14 (1.18) | 0.83 (1.64) | −0.63 (1.13) |
| Control Variables | ||||
| Age (in years) | −0.37 (0.15)* | −0.04 (0.14) | −0.32 (0.16)* | −0.08 (0.13) |
| Female Gender (ref= male) | −4.55 (1.98)* | 0.03 (1.80) | −0.95 (2.17) | 3.32 (1.76) |
| Injection Drug User (ref= non-IDU) | −2.44 (1.95) | −1.14 (1.75) | −0.22 (2.39) | −0.23 (1.68) |
| Days of Cocaine Use, Past 30 days | −0.02 (0.08) | −0.22 (0.07)** | −0.13 (0.10) | −0.09 (0.07) |
| 3 months (ref= baseline) | 3.05 (1.86) | −2.13 (1.67) | 1.27 (2.35) | −1.53 (1.60) |
| 6 months (ref= baseline) | 2.19 (1.72) | −2.95 (1.54) | 3.71 (2.18) | −0.23 (1.47) |
| (Intercept) | 81.47 (7.46) | 76.11 (6.76) | 82.99 (8.27) | 66.21 (6.58) |
*
< 0.05
**
< 0.01.
Notes: ref=reference group. b = unstandardized partial regression coefficient. SE = standard error. Treatment enrollment status, days of opiate and cocaine use, and urine tests are time-varying predictors.