| Intervention (N = 70) | Control (N = 74) |  |  | ||
---|---|---|---|---|---|---|
 | N | n (%) | N | n (%) | Risk Ratio (95% CI) | p-value |
Primary outcome | ||||||
Self-reported 7-day point prevalence abstinence at the 12-month follow-up | 70 | 17 (24.3%) | 74 | 16 (21.6%) | 1.12 (0.62–2.05) | 0.704 |
Bio-validated quit rate | Â | Â | Â | Â | 0.63 (0.16, 2.56) | 0.261 |
Secondary outcomes | ||||||
Readiness to quit smoking | 70 | Â | 74 | Â | Â | 0.003* |
 Pre-contemplation |  | 11 (18.6%) |  | 35 (47.3%) |  |  |
 Contemplation |  | 14 (18.6%) |  | 11 (14.9%) |  |  |
 Preparation |  | 29 (32.9%) |  | 10 (13.5%) |  |  |
 Action |  | 10 (21.4%) |  | 14 (18.9%) |  |  |
 Maintenance |  | 6 (8.6%) |  | 4 (5.4%) |  |  |
 |  | Mean ± SD |  | Mean ± SD | Mean Difference (95% CI) |  |
Average daily cigarette consumption in the past 12 months | 70 | 11.22 ± 9.24 | 73 | 11.17 ± 8.43 | 0.052 (−2.87–2.97) | 0.972 |
Average number of quit attempts in the past 12 months | 70 | 0.79 ± 1.19 | 74 | 0.66 ± 1.82 | 0.13 (− 0.38–0.63) | 0.632 |
Importance of quitting | 69 | 82.54 ± 19.55 | 74 | 74.93 ± 20.26 | 7.60 (1.01–14.20) | 0.024 |
Difficulty in quitting | 69 | 69.28 ± 23.16 | 74 | 64.39 ± 27.93 | 4.88 (−3.59–13.35) | 0.256 |
Confidence in being able to quit | 69 | 63.33 ± 23.93 | 73 | 58.29 ± 27.19 | 4.32 (− 4.14–12.78) | 0.312 |
Psychological flexibility | 60 | 27.80 ± 3.52 | 53 | 27.42 ± 3.68 | 0.38 (− 0.96–1.73) | 0.571 |
Changes in the secondary outcomes from baseline to 12 months | ||||||
 |  | n (%) |  | n (%) |  |  |
Readiness to quit smoking | 70 | Â | 74 | Â | Â | 0.014 |
 Less than before |  | 13 (18.6%) |  | 30 (40.5%) |  |  |
 Same as before |  | 28 (40.0%) |  | 24 (32.4%) |  |  |
 More than before |  | 29 (41.4%) |  | 20 (27.0%) |  |  |
 |  | Mean ± SD |  | Mean ± SD | Mean Difference (95% CI) |  |
Average number of quit attempts | 70 | 0.79 ± 1.19 | 74 | 0.66 ± 1.82 | 0.13 (− 0.38–0.63) | 0.632 |
Importance of quitting | 69 | 10.22 ± 19.41 | 74 | 4.93 ± 17.95 | 5.28 (− 0.89–11.46) | 0.093 |
Difficulty in quitting | 69 | − 1.38 ± 16.13 | 74 | − 1.42 ± 14.70 | 0.04 (− 5.06–5.14) | 0.987 |
Confidence in being able to quit | 69 | 9.13 ± 20.49 | 73 | 2.19 ± 20.09 | 6.21 (− 0.73–13.16) | 0.079 |
Psychological flexibility | 48 | 1.42 ± 2.94 | 44 | 0.16 ± 2.22 | 1.26 (0.18–2.33) | 0.022 |