Association between incident bronchitis and asthma and pulmonary function indices at study entry.

a<p>FVC, forced vital capacity; FEV₁, forced expiratory volume in 1s; MMEF, forced expiratory flow over the mid-range of expiration.</p>b<p>Relative risks (RR) and 95% confidence intervals (CI) of outcomes were scaled across the inter-quartile range elevation by each pulmonary function index.</p><p>All models were adjusted for community, <i>in utero</i> exposure to maternal smoking, family history of asthma, family history of atopy, active smoking and current SHS.