Characteristics of the total study population by worker type
| Office | Factory | Total | |
| Subjects n | 76 | 167 | 243 |
| Sex | |||
| Male | 35 (46.1) | 107 (64.1) | 142 (58.4) |
| Female | 41 (53.9) | 60 (35.9) | 101 (41.6) |
| Age yrs | |||
| ≤25 | 9 (11.8) | 96 (57.5) | 105 (43.2) |
| 26–30 | 15 (19.7) | 48 (28.7) | 63 (25.9) |
| ≥31 | 52 (68.4) | 23 (13.8) | 75 (30.9) |
| Education | |||
| Primary/high school | 28 (36.8) | 95 (56.9) | 123 (50.8) |
| Vocational training/college | 17 (22.4) | 33 (19.8) | 50 (20.7) |
| Bachelor/higher university degree | 30 (39.5) | 39 (23.4) | 69 (28.5) |
| Smoking status | |||
| Never | 55 (75.4) | 107 (64.1) | 162 (67.5) |
| Past | 5 (6.8) | 14 (8.4) | 19 (7.9) |
| Current | 13 (17.8) | 46 (27.5) | 59 (24.6) |
| SHS exposure at work and/or home | 32 (42.1) | 107 (64.1) | 139 (57.2) |
| Parental atopy/asthma | 15 (19.7) | 23 (13.8) | 38 (15.6) |
| Work stress | 14 (18.7) | 16 (9.6) | 30 (12.4) |
Data are presented as n (%), unless otherwise indicated. SHS: second-hand smoke.