Baseline characteristics of subjects by intervention group
| Control (n=103) | Intervention (n=115) | |
|---|---|---|
| *Mean (SD). | ||
| Sociodemographic data | ||
| Age (years) | 43.3 (8.3) | 43.1 (8.2) |
| Sex (% males) | 85.4 | 87.0 |
| Civil status (% married) | 81.6 | 84.2 |
| Occupation (% manual workers) | 54.4 | 54.8 |
| Educational level | ||
| No formal education (%) | 24.3 | 23.5 |
| Primary (%) | 17.5 | 16.5 |
| Secondary (%) | 33.0 | 39.1 |
| University (%) | 25.2 | 20.9 |
| Body mass index (kg/m2) | 27.2 (4.5) | 26.4 (3.8) |
| Tobacco consumption | ||
| Cigarettes per day | 27.6 (11.7) | 25.0 (10.6) |
| Expired carbon monoxide (ppm) | 37.0 (19.0) | 37.0 (17.5) |
| Reasons for quitting | ||
| If quitting were easy, would be highly likely to quit (%) | 97.1 | 100 |
| Has strong or very strong desire to quit (%) | 78.6 | 76.5 |
| Prospects of this attempt to quit being successful regarded as sure or very probable (%) | 57.3 | 52.2 |
| Quitting regarded as easy or very easy (%) | 8.7 | 13.0 |
| Health reasons or under doctor‘s orders to quit (%) | 86.4 | 92.2 |
| Smoking history and attempts to quit | ||
| Age at start of smoking regularly (years) | 16.6 (4.0) | 16.5 (3.3) |
| Duration of tobacco consumption (years) | 26.6 (8.6) | 26.9 (8.6) |
| In the past 5 years has seriously contemplated quitting (%) | 78.6 | 84.3 |
| In the past 5 years has tried to quit smoking: | ||
| Never (%) | 35.3 | 41.7 |
| Once (%) | 21.6 | 32.2 |
| Two or three times (%) | 28.4 | 19.1 |
| Four or more times (%) | 14.7 | 7.0 |
| Maximum time has successfully refrained from smoking at any one attempt to quit | ||
| Less than 2 weeks (%) | 49.2 | 42.6 |
| 2 weeks to 6 months (%) | 35.4 | 35.3 |
| More than 6 months (%) | 15.4 | 22.1 |
| Social setting | ||
| Spends major part of the time with other smokers (%) | 52.4 | 53.9 |
| Spouse/companion is a smoker (%) | 37.9 | 42.6 |
| Has first degree family relatives who are smokers (%) | 88.3 | 86.1 |
| During the working day spends major part of the time with smokers (%) | 21.4 | 19.1 |
| During leisure hours spends major part of the time with smokers (%) | 43.7 | 47.0 |
| Assessment of health | ||
| Optimal subjective health in the past year (%) | 73.8 | 69.6 |
| Presence of tobacco related symptoms (%) | 65.0 | 60.0 |
| Dependence | ||
| Fagerström test score | 5.1 (2.8) | 4.5 (2.4) |
| Fagerström score ≤4 (grade I intervention) (%) | 39.8 | 42.6 |
| Fagerström score 5–7 (grade II intervention) (%) | 36.9 | 45.2 |
| Fagerström score ≥8 (grade III intervention) (%) | 23.3 | 12.2 |
| Study sites | ||
| Empresa de Transportes Colectivos de Bilbao, S.A. (%) | 54.4 | 59.1 |
| Iberdrola-Gardoqui (%) | 28.2 | 26.1 |
| Iberdrola-Larrasquitu (%) | 17.5 | 14.8 |