| Referents | Traffic officers | p-valuea |
---|---|---|---|
 | (n = 57) | (n = 77) |  |
Age, n (%) | |||
   <30 years | 16 (28%) | 36 (47%) |  |
   30-40 years | 19 (33%) | 31 (40%) |  |
   >40 years | 22 (39%) | 10 (13%) | 0.002 |
Gender, n (%) | |||
   Male | 38 (67%) | 47 (61%) |  |
   Female | 19 (33%) | 30 (39%) | 0.58 |
Cigarette smoking, n (%) | |||
   Never | 26 (46%) | 40 (52%) |  |
   Ever | 31 (54%) | 37 (48%) | 0.49 |
Cigarettes/day, n (%)b | |||
   1-10 cigarettes/day | 9 (40%) | 5 (18%) |  |
   11-20 cigarettes/day | 7 (30%) | 16 (57%) |  |
   >20 cigarettes/day | 7 (30%) | 7 (25%) | 0.15 |
Pack-years of smoking, n (%) | |||
   0 pack-years | 26 (45%) | 40 (52%) |  |
   0.1-10 pack-years | 14 (25%) | 22 (28%) |  |
   >10 pack-years | 17 (30%) | 15 (20%) | 0.39 |
Exposure to environmental tobacco smoke, n (%)c | |||
   No | 14 (54%) | 24 (60%) |  |
   Yes | 12 (46%) | 16 (40%) | 0.30 |
Alcohol consumption, n (%)d | |||
   Occasional/never | 24 (44%) | 40 (56%) |  |
   Every week | 14 (26%) | 18 (26%) |  |
   Every day | 16 (30%) | 13 (18%) | 0.27 |