Abstract
Summary 677 cases of congenital deafness were analysed in order to find out the proportion of various causes of congenital deafness. Criteria for diagnosing deafness as congenital are discussed and the sample for the study was selected according to this criteria. The results showed that 36% of congenital deafness was of genetic origin. In 30·5% the cause was unknown. In 13·4% the cause was neonatal anoxia and in 12·2% haemolytic disease of the newborn and 5·9% rubella. In cases of children examined in 1964, 1965 and 1966, the proportion of maternal rubella cases was 33·7%. It is thought that although a considerable proportion within the “unknown” group is probably of genetic origin in a large number of cases, within this group deafness was caused by so far completely unsuspected aetiological influences.
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