Association between maternal body mass index and number of wheezing days in the offspring in the imputed data, stratified by maternal atopy
| Model | No maternal atopy | Maternal atopy | p-value interaction | ||
| IRR (95% CI) | p-value | IRR (95% CI) | p-value | ||
| 1 | 1.027 (1.007–1.048) | 0.01 | 0.978 (0.951–1.005) | 0.11 | <0.01 |
| 2 | 1.020 (1.000–1.042) | 0.05 | 0.980 (0.953–1.008) | 0.16 | <0.01 |
| 3 | 1.023 (1.003–1.045) | 0.03 | 0.981 (0.953–1.010) | 0.19 | <0.01 |
| 4 | 1.022 (1.001–1.043) | 0.04 | 0.980 (0.953–1.008) | 0.16 | <0.01 |
| 5 | 1.010 (0.988–1.033) | 0.38 | 0.976 (0.949–1.004) | 0.09 | 0.03 |
IRR: incidence rate ratio; 1: univariable; 2: daycare, breastfeeding, older siblings, smoke exposure during pregnancy, pet keeping, socioeconomic status, ethnicity and maternal age; 3: all variables of model 2 and birthweight; 4: all variables of model 2 and compliance of the respiratory system; 5: all variables of model 2 and resistance of the respiratory system.