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Urine drug screening (UDS) frequency and 1-year treatment retention
| UDS frequency per month | Patients (N) | One-year retention, N (%) | Unadjusted OR | Unadjusted 95% CI | Adjusted OR | Adjusted 95% CI |
| Less than monthly* | 6252 | 250 (4.0) | ||||
| Biweekly | 9495 | 1398 (14.72) | 3.18 | 2.71 to 3.72 | 3.20 | 2.75 to 3.75 |
| Weekly | 24 948 | 6185 (24.79) | 6.07 | 5.22 to 7.05 | 6.86 | 5.88 to 8.00 |
| More than weekly | 15 226 | 4153 (27.28) | 6.90 | 5.93 to 8.03 | 8.03 | 6.87 to 9.38 |
*Reference group.
