Environmental tobacco smoke (ETS) exposure from the mother as risk factor for asthma, ever wheeze and current wheeze in non-smokers at age 16–17 years expressed as adjusted ORs by multiple logistic regression analyses*
| Independent variables | Categories | Dependent variables | |||||
| Physician-diagnosed asthma | Ever wheeze | Current wheeze | |||||
| OR | 95% CI | OR | 95% CI | OR | 95% CI | ||
| In utero exposure | No | 1 | 1 | 1 | |||
| Yes | 1.26 | 0.94 to 1.70 | 1.07 | 0.84 to 1.37 | 1.19 | 0.93 to 1.54 | |
| ETS at age 7/8 | No | 1 | 1 | 1 | |||
| Yes | 1.42 | 1.07 to 1.87 | 1.27 | 1.02 to 1.59 | 1.21 | 0.95 to 1.54 | |
| ETS at age 16/17 | No | 1 | 1 | 1 | |||
| Yes | 1.40 | 1.04 to 1.88 | 1.26 | 0.98 to 1.61 | 1.20 | 0.92 to 1.56 | |
| Continuous ETS exposure | No | 1 | 1 | 1 | |||
| Yes | 1.51 | 1.07 to 2.14 | 1.43 | 1.07 to 1.92 | 1.23 | 0.90 to 1.67 | |
↵* Other variables included in the models were sex, family history of asthma, current place of residence, house dampness and birth weight <2500 g. The variables regarding ETS from the mother were included one at a time.