Table 3.
Factors associated with positive urine morphine test outcome in a multivariate binary logistic regression
| Variable | β | OR (95 % CI) | P |
|---|---|---|---|
| Age (years) | |||
| <40 | 1 | ||
| 40–44 | −0.557 | 0.57 (0.35–0.94) | 0.027 |
| 45–49 | −0.903 | 0.41 (0.24–0.67) | <0.001 |
| ≥50 | −0.646 | 0.52 (0.33–0.85) | 0.008 |
| Gender | |||
| Male | 1 | ||
| Female | 0.427 | 1.53 (1.01–2.32) | 0.044 |
| Route of heroin use history | |||
| Inhalation | 1 | ||
| Inhalation + Injection | 0.693 | 2.00 (1.19–3.36) | 0.009 |
| Injection | 0.089 | 1.09 (0.74–1.61) | 0.650 |
| Daily MMT dosages (mg) | |||
| <60 | 1 | ||
| 60–80 | −0.250 | 0.78 (0.53–1.14) | 0.200 |
| >80 | 0.862 | 2.37 (1.35–4.15) | 0.003 |
| Cumulative years of methadone treatment | |||
| ≤1 | 1 | ||
| >1–3 | 0.303 | 1.35 (0.72–2.55) | 0.349 |
| >3–6 | 0.472 | 1.60 (0.87–2.94) | 0.128 |
| >6 | 0.301 | 1.35 (0.71–2.58) | 0.361 |
| Constant | −0.329 | 0.310 | |