Table 2.
Comparison of urine results by taper group and time-point (n = 516).
| Time-point | Percentage of participants with drug-free UA (n)
|
χ2 value | P-value | |
|---|---|---|---|---|
| 7-day (n = 255) | 28-day (n = 261) | |||
| Opiates | ||||
| End of taper | 44.31 (113) | 29.89 (78) | 11.52 | 0.0007 |
| 1-month follow-up | 17.65 (45) | 17.62 (46) | 0.00 | 0.9946 |
| 3-month follow-up | 12.16 (31) | 13.41 (35) | 0.18 | 0.6700 |
| All drugs | ||||
| End of taper | 24.71 (63) | 18.77 (49) | 2.67 | 0.1022 |
| 1-month follow-up | 10.98 (28) | 11.49 (30) | 0.03 | 0.8534 |
| 3-month follow-up | 6.67 (17) | 9.20 (24) | 1.13 | 0.2883 |
UA: urine analysis.