Lung function by smoke exposure
| Maternal smoking | Coefficient | 95% CI | P |
| FRC1 ml mean (SD) | -4.2 | -9 to 0.4 | 0.08 |
| tPTEF/tE2 % | -4.7 | -8 to -1.3 | 0.01 |
| eNO 3ppb | -2.0 | -4 to -0.3 | 0.05 |
| Household tobacco smoke | |||
| FRC ml | -4.9 | -9 to -8 | 0.02 |
| tPTEF/tE % | -3.0 | -6 to -0.1 | 0.05 |
| eNO ppb | -1.2 | -3 to 0.5 | 0.2 |
1: functional residual capacity, 2: ratio of time to peak tidal expiratory flow over total expiratory time, 3: exhaled nitric oxide