Method | Quitting definition | Month | Quit.ie | AC | P values* | ||||
No of quitters | Sample size | Quit rate | No of quitters | Sample size | Quit rate | ||||
ITT | Russell Standard | 1 | 30 | 149 | 20.1% | 57 | 151 | 37.7% | <0.001† |
3 | 22 | 149 | 14.8% | 40 | 151 | 26.5% | 0.006† | ||
6 | 23 | 149 | 15.4% | 35 | 151 | 23.2% | 0.045† | ||
12 | 17 | 149 | 11.4% | 33 | 151 | 21.9% | 0.008† | ||
Self-report | 1 | 36 | 149 | 24.2% | 63 | 151 | 41.7% | <0.001† | |
3 | 26 | 149 | 17.5% | 48 | 151 | 31.8% | 0.002† | ||
6 | 25 | 149 | 16.8% | 42 | 151 | 27.8% | 0.011† | ||
12 | 21 | 149 | 14.1% | 36 | 151 | 23.8% | 0.016† | ||
CCA | Russell Standard | 1 | 30 | 69 | 43.5% | 57 | 110 | 51.8% | 0.139 |
3 | 22 | 46 | 47.8% | 40 | 81 | 49.4% | 0.433 | ||
6 | 23 | 41 | 56.1% | 35 | 72 | 48.6% | 0.778 | ||
12 | 17 | 38 | 44.7% | 33 | 63 | 52.4% | 0.228 | ||
Self-report | 1 | 36 | 124 | 29.0% | 63 | 134 | 47.0% | 0.002† | |
3 | 26 | 114 | 22.8% | 48 | 130 | 36.9% | 0.008† | ||
6 | 25 | 108 | 23.1% | 42 | 120 | 35.0% | 0.025† | ||
12 | 21 | 105 | 20.0% | 36 | 107 | 33.6% | 0.013† |
*The alternative hypothesis is that AC has a higher quit rate than Quit.ie.
†The test is significant at 0.05 level.
AC, Allen Carr’s Easyway to Stop Smoking; CCA, complete case analysis; CO, carbon monoxide; ITT, intention-to-treat.