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

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