Table 4.
Predictors of abstinence from baseline to follow-up (N = 123 patients)
| Parameter | Bivariate analysis | P valuea | Multivariate analysis | P valueb |
|---|---|---|---|---|
| OR (95 % CI) | OR (95 % CI) | |||
| Age | 1.02 (0.98–1.06) | 0.267 | – | |
| Female | 1.27 (0.60–2.67) | 0.528 | – | |
| Education (years) | 1.05 (0.88–1.25) | 0.619 | – | |
| Relationship status, single | 0.56 (0.25–1.30) | 0.175 | 0.45 (0.17–1.25) | 0.127 |
| Main diagnosis | 1.23 (0.45–3.34) | 0.687 | – | |
| Severity scores | ||||
| Non-injection use | 2.59 (1.21–5.54) | 0.014 | 3.36 (1.32–8.56) | 0.011 |
| Years of using most problematic substance | 1.01 (0.96–1.1) | 0.699 | – | |
| Overdoses | 0.92 (0.43–1.97) | 0.840 | – | |
| Suicide attempts lifetime | 1.32 (0.63–2.79) | 0.456 | ||
| Treatment variables | ||||
| Days in treatment | 1.00 (0.98–1.02) | 0.511 | – | |
| Voluntary treatment | 0.31 (0.14–0.68) | 0.004 | 3.40 (1.29–8.93) | 0.011 |
| Follow-up variables | ||||
| Abstinence at follow-up | 1.51 (0.63–3.66) | 0.356 | – | |
| Time in a controlled environment (days)c | 1.07 (1.03–1.10) | <0.001 | 1.08 (1.04–1.12) | <0.001 |
a P value obtained from bivariate logistic regression
b P value obtained from multivariable logistic regression; multivariable analysis included variables with p values <0.20 in bivariate analyses
cTime in controlled environment in last 30 days before follow-up interview