FIGURE 2.

Spirometric lung function post-bronchodilation at 24 years in the asthma groups compared with the never asthma group (reference) expressed as Z-score with multiple linear regression adjusted for: maternal and paternal asthma, maternal smoking during pregnancy, respiratory syncytial virus infection up to 19 months of age, secondary smoke exposure, daily smoking at 24 years of age, living on a busy road at age 24, childhood allergic sensitisation and body mass index at 24 years of age. a) Forced expiratory volume in 1 s (FEV₁). b) Forced vital capacity (FVC). c) FEV₁/FVC. ^#: p-interaction.