“…The lack of control series has limited the value of many investigations of the aetiology of cerebral palsy (Little, 1862;Patten, 1931;Stewart, 1942;Yannet, 1944). In the present study patients suffering from diplegia are compared in respect of social factors, maternal reproductive history and perinatal history with groups of prematurely and maturely born children derived from approximately the same population.…”