The general purpose of the Leicester cohorts is to study the childhood epidemiology of wheezing disorders and other common respiratory problems such as chronic cough, chronic rhinitis and habitual snoring.
More specifically, the major aims are:
(i) To estimate the prevalence, incidence and secular trends of these respiratory disorders in young children;
(ii) To study the effects of risk factors on incidence and persistence of wheezing disorders taking into account different age-exposure windows;
(iii) To study wheezing disorders in children of south Asian origin, the predominant British ethnic minority
(iv) To study the natural history of wheeze and chronic cough and to identify and define different phenotypes in childhood.