Associations of maternal age at delivery (continuous, per 5-year increase) with forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC), FEV1/FVC ratio and FEV1 decline with adjustments for age at the second survey, sex, height, maternal smoking during pregnancy and number of older siblings
| Adjusted coefficient# β (95% CI) | Intercept¶ | |
| FEV1 mL | 11.66 (1.71–21.61) | 4265 |
| FVC mL | 5.42 (−5.80–16.63) | 5294 |
| FEV1/FVC % | 0.19 (0.05–0.32) | 81 |
| FEV1 decline mL§ | 1.73 (−4.26–7.72) | 277 |
n=12 421. #: per 5-year increase in maternal age at delivery after age 14 years in an adjusted multilevel linear mixed model with centre as a random intercepts and adjustments for age at the second survey, sex, height, maternal smoking during pregnancy and number of older siblings; ¶: centred at maternal age at delivery of 14 years; §: decline in FEV1 in mL per year of follow-up (FEV1 in European Community Respiratory Health Survey (ECRHS) I minus FEV1 in ECRHS II; a positive value represents decline).