Table 2.
Abstinence rates at different time points
| Intervention (n=484) |
Control (n=488) |
Absolute difference (95% CI) | P value | Relative risk (95% CI) |
P value | |
| Primary outcome: biochemically validated self-reported continuous smoking abstinence at 6 months | 35 (7.2%) | 20 (4.1%) | 3.3 (0.3 to 6.3) |
0.032 | 1.76 (1.03 to 3.01) |
0.038 |
| Self-reported 7-day abstinence at 1 month | 94 (19.4%) | 49 (10.0%) | 9.0 (4.9 to 13.7)* |
<0.0001 | 1.92 (1.39 to 2.64) |
<0.0001 |
| Self-reported 7-day abstinence at 3 months | 113 (23.3%) | 58 (11.9%) | 11.3 (6.6 to 16.1) |
<0.0001 | 1.97 (1.47 to 2.63) |
<0.0001 |
| Self-reported 7-day abstinence at 6 months | 113 (23.3%) | 63 (12.9%) | 10.6 (5.86 to 15.41) |
<0.0001 | 1.80 (1.36 to 2.38) |
<0.0001 |
*Based on Gaussian model with robust variances due to lack of convergence.