Table 2

Abstinence rates at different time points

Intervention
(n=484)
Control
(n=488)
Absolute difference (95% CI)P valueRelative risk
(95% CI)
P value
Primary outcome: biochemically validated self-reported continuous smoking abstinence at 6 months35 (7.2%)20 (4.1%)3.3
(0.3 to 6.3)
0.0321.76
(1.03 to 3.01)
0.038
Self-reported 7-day abstinence at 1 month94 (19.4%)49 (10.0%)9.0
(4.9 to 13.7)*
<0.00011.92
(1.39 to 2.64)
<0.0001
Self-reported 7-day abstinence at 3 months113 (23.3%)58 (11.9%)11.3
(6.6 to 16.1)
<0.00011.97
(1.47 to 2.63)
<0.0001
Self-reported 7-day abstinence at 6 months113 (23.3%)63 (12.9%)10.6
(5.86 to 15.41)
<0.00011.80
(1.36 to 2.38)
<0.0001
  • *Based on Gaussian model with robust variances due to lack of convergence.