| Written questionnaire | Video questionnaire | |
| Ever wheeze | 1.07** (1.04–1.09) | 1.10** (1.06–1.13) |
| Current wheeze | 1.06* (1.01–1.11) | 1.06* (1.00–1.13) |
| Night wheeze | 1.00 (0.94–1.07) | 1.05* (1.01–1.10) |
| Severe wheeze | 1.03 (0.95–1.12) | 1.08** (1.04–1.11) |
| Wheeze with exercise | 1.16** (1.13–1.19) | 1.16** (1.14–1.19) |
| Asthma | 1.02 (0.98–1.06) | |
| Night cough | 1.08** (1.05–1.10) | 1.14** (1.10–1.17) |
Data are presented as OR (95% CI). All models were adjusted for parental education level, number of smokers at home, incense burning, active smoking, alcohol use and history of rhinitis and eczema. *: p <0.05; **: p<0.01.