DEMOGRAPHIC FACTORS AND THE INCIDENCE OF DOWN'S SYNDROME IN IRELAND*

Abstract
Census data on Downs''s syndrome in Ireland reveal such a high prevalence rate that birth incidence must be undeniably higher than in most, if not all, other countries which report such findings. Furthermore, though there are some indications in the census data that incidence at birth may be falling, it is likely to remain comparatively higher than elsewhere because of a relatively large family size and high fertility rates in the 35 yr and over age-groups and also because amniocentesis and abortion are not available here. Given this situation the demand for special health and educational services for persons with this condition will not lessen greatly. In order to adequately plan for this demand it is important that attention be given to the study of live-birth incidence and infant/child mortality in this condition.