| (B) Risk with duration of passive smoke exposure | ||||
| Cases (n=248) | Controls (n=360) | Age OR (95% CI) | aOR (95% CI) | |
| Duration of home exposure | ||||
| >5 hours/day | 3 (1.2) | 3 (0.8) | 1.9 (0.4–9.8) | 2.6 (0.4 to 15.1) |
| 1–5 hours/day | 19 (7.7) | 18 (5.0) | 1.7 (0.9–3.5) | 2.1 (1.0 to 4.6) |
| <1 hour/day | 33 (13.3) | 26 (7.2) | 2.0 (1.1–3.4) | 2.9 (1.5 to 5.6) |
| Not exposure to passive smoking at home | 193 (77.8) | 313 (86.9) | 1.0 | 1.0 |
| Duration of passive smoking in public | ||||
| >5 hours/day | 32 (12.9) | 35 (9.7) | 1.3 (0.7–2.2) | 1.6 (0.8 to 3.1) |
| 1–5 hours/day | 72 (29.0) | 95 (26.4) | 1.2 (0.8–1.8) | 1.6 (0.9 to 2.6) |
| <1 hour/day | 61 (24.6) | 109 (30.3) | 0.9 (0.6–1.4) | 1.2 (0.7 to 2.0) |
| Not exposure to passive smoking in public | 83 (33.5) | 121 (33.6) | 1.0 | 1.0 |
ORs were adjusted for age (age OR) and for age, sex, regular alcohol consumption, reported hypertension, hypercholesterolaemia, diabetes and BMI (aOR).
*9 cases did not specify exposure to passive smoking in the questionnaire and so were left out of this analysis.
aOR, adjusted OR; BMI body mass index.