Associations# between longitudinal household air pollution profiles and respiratory outcomes stratified by ventilation parameters
| Current asthma OR (95% CI) | pinteraction-value | ||
| Exhaust fan in use | Exhaust fan not in use | ||
| Least exposed (reference¶) | 1 | 1 | |
| Wood heating | 1.21 (0.73–2.02) | 5.47 (1.06–28.28)* | 0.03 |
| All gas | 1.33 (0.70–2.53) | 6.77 (1.25–36.56)* | 0.02 |
| Wood heating/smoking | 1.51 (0.83–2.75) | 10.53 (1.92–57.65)* | 0.01 |
| Wood and gas heating/gas cooking/smoking | 1.41–0.61–3.23) | 20.11 (1.64–246.12)* | 0.06 |
| Build year before 1990 | Build year after 1990 | ||
| All electric | 0.74 (0.31–1.73) | 7.77 (1.40–42.98)* | 0.01 |
#: adjusted for age, sex, atopy, nitrogen dioxide and occupation at the sixth decade; ¶: reference group included people who used electric cooking, air conditioning for heating and no smoking. *: p<0.05.