Impact of the intervention on primary and secondary outcomes
| 3-month assessment | 6-month assessment | Intent-to-treat analysis intervention group change* | ||||||
|---|---|---|---|---|---|---|---|---|
| Intervention (n=174), no. (%) or mean±SD | Control (n=193), no. (%) or mean±SD | p Value | Intervention (n=159), no. (%) or mean±SD | Control (n=177), no. (%) or mean±SD | p Value | Effect† | p Value | |
| Primary outcome | ||||||||
| Home smoking ban | ||||||||
| Full ban | 81 (46.6) | 49 (25.4) | <0.0001‡ | 100 (62.9) | 68 (38.4) | <0.0001‡ | 1.48‡ | <0.0001‡ |
| No full ban | 93 (53.4) | 144 (74.6) | 59 (37.1) | 109 (61.6) | ||||
| Partial ban | 58 (33.3) | 89 (46.1) | 0.0001§ | 39 (24.5) | 59 (33.3) | <0.0001§ | 1.61§ | <0.001§ |
| No ban | 35 (20.1) | 55 (28.5) | 20 (12.6) | 50 (28.3) | ||||
| Secondary outcomes—baseline smokers only | ||||||||
| Smokers | (n=113) | (n=127) | (n=96) | (n=107) | ||||
| No. of cigs/day | 7.6±8.1 | 10.0±8.2 | 0.03 | 7.5±8.1 | 9.1±6.8 | 0.13 | 0.30 | 0.04 |
| Quit attempts past 3 months | 1.6±1.9 | 1.3±1.4 | 0.20 | 1.1±1.4 | 1.0±1.5 | 0.65 | 0.42 | 0.78 |
| Confidence in quitting | 7.0±2.8 | 6.5±2.5 | 0.16 | 7.0±2.9 | 6.4±2.4 | 0.09 | 0.11 | 0.08 |
*Intent-to-treat analyses are growth models that include data from all participants including those who were not reached for 3 and/or 6 months follow-up.
†Effect for full and partial ban is an OR; quit attempt is an event rate ratio and β for the other outcomes.
‡Binary comparison: full versus no full ban.
§Ordinal comparison: full versus partial versus no ban.