From: Protocol for the Proactive Or Reactive Telephone Smoking CeSsation Support (PORTSSS) trial
Control (reactive support, no offer of NRT) group quit rate at 6 months (%) | Comparison "group" quit rate at 6 months (%) | Intervention "group" quit rate at 6 months (%) | Odds ratio for each treatment effect (proactive vs reactive, NRT vs no NRT) | Power | Required sample size per group (total for 4 groups) |
---|---|---|---|---|---|
12%* | 14% | 18.6% | 1.4 | 80% | 644 (2576) |
12%* | 14.5% | 20.3% | 1.5 | 80% | 426 (1704) |
12% | 14.5% | 20.3% | 1.5 | 90% | 550 (2200) |
8%** | 9.5% | 12.8% | 1.4 | 80% | 888 (3552) |
8%** | 10% | 14% | 1.5 | 80% | 587 (2348) |
8%** | 10% | 14% | 1.5 | 90% | 760 (3040) |