Smoking cessation outcomes at 12 months follow-up comparing participants in observation phase (August 2009 to October 2010) and intervention phase (November 2010 to February 2012) at four university sites in Switzerland. Seven-day point prevalence abstinence, validated by exhaled carbon monoxide*
| N total for analysis | Per cent of quit in obs. phase/interv. phase | Risk ratio (95% CI) | Absolute risk difference (%) | p Value | |
|---|---|---|---|---|---|
| Main outcome | |||||
| Intervention sites (study sites A and B) (n=458) | 443 | 42.0/50.2 | 1.20 (0.98 to 1.47) | 8.3 | 0.08 |
| Control sites (study sites C and D) (n=436) | 428 | 46.8/47.8 | 1.02 (0.84 to 1.25) | 1.1 | 0.8 |
| Secondary analyses for participants in intervention sites (study sites A and B) (n=440) | |||||
| Cardiac rehabilitation | |||||
| With cardiac rehabilitation | 296 | 51.5/53.7 | 1.04 (0.84 to 1.30) | 2.2 | 0.7 |
| No cardiac rehabilitation | 143 | 29.5/43.6 | 1.48 (0.95 to 2.30) | 14.1 | 0.09 |
| Education status | |||||
| University degree | 64 | 59.3/51.3 | 0.87 (0.56 to 1.34) | −7.9 | 0.5 |
| No university degree | 371 | 40.7/50.8 | 1.24 (1.0 to 1.6) | 10.1 | 0.05 |
*Participants lost to follow-up or who withdrew consent (n=11, 97% follow-up rate) considered as smokers for these analyses. Participants who died (n=15) during follow-up excluded from these analyses. Validated smoking cessation by carbon monoxide (CO) in 68% of quitters in intervention sites and 40% of quitters in control sites. Two participants reported having quit during last 7 days despite a CO level of more than 10 ppm considered as smokers.
N, number of participants.