| aOR | 95% CI | P value | |
---|---|---|---|---|
 |  | Lower bounds | Upper bounds |  |
Sex (male) | 2.231 | 1.627 | 3.060 | < 0.0001 |
Age (years) | 1.012 | 0.990 | 1.033 | 0.283 |
Highest level of education | ||||
 Grade 8 and below | 1.787 | 1.129 | 2.829 | 0.013 |
 Grades 9–12 | 1.139 | 0.803 | 1.617 | 0.465 |
 College/university, trade school, or masters/PhD | 0.855 | 0.612 | 1.199 | 0.365 |
Employment status | 0.817 | 0.578 | 1.110 | 0.183 |
Marital status | ||||
 Married/common law/living with partner | 1.826 | 1.317 | 2.533 | < 0.0001 |
Source of first opioid exposure | ||||
 Physician prescribed | 1.540 | 1.132 | 2.094 | 0.006 |
Smoking status | ||||
 Current smoker | 1.050 | 0.675 | 1.634 | 0.827 |
Self-reported substance use in the past 30 days | ||||
 Alcohol | 0.950 | 0.698 | 1.292 | 0.742 |
 Benzodiazepine | 0.680 | 0.398 | 1.160 | 0.157 |
 Heroin | 0.917 | 0.550 | 1.527 | 0.738 |
 Cocaine | 0.846 | 0.559 | 1.281 | 0.430 |
 Amphetamine | 1.107 | 0.540 | 2.269 | 0.781 |
 Crack cocaine | 1.256 | 0.697 | 2.263 | 0.449 |
 Cannabis | 0.826 | 0.608 | 1.123 | 0.222 |
 Illicit methadone | 4.464 | 0.915 | 21.769 | 0.064 |
 Other drug* | 0.970 | 0.715 | 1.316 | 0.847 |
Methadone dose (mg/day) | 1.000 | 0.995 | 1.002 | 0.506 |
Length of current treatment (months) | 1.000 | 0.996 | 1.004 | 0.924 |
Age of first opioid use | 1.028 | 1.003 | 1.053 | 0.029 |
Illicit opioid use by urine screens At least 1 positive urine screen during 3 month study period | 1.108 | 0.803 | 1.529 | 0.534 |