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Quit rates at 6 months among subgroups
| Intervention group n/N (%) | Control group n/N (%) | Significance of interaction term* | |
| Sex | |||
| Men | 8/87 (9) | 3/61 (5) | p = 0.5 |
| Women | 7/82 (9) | 9/88 (10) | |
| Stage-of-change | |||
| 'pre-contemplation' | 1/58 (2) | 2/61 (3) | p = 0.6 |
| 'contemplation' | 2/62 (3) | 2/48 (4) | |
| 'preparation' | 5/33 (15) | 6/35 (17) |
* intervention group (intervention or control) X level of subgroup
