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  • Title: Mental subnormality in Northern Ireland.
    Author: McDonald G, MacKay DN.
    Journal: J Ment Defic Res; 1978 Jun; 22(2):83-9. PubMed ID: 671534.
    Abstract:
    A prevalence survey of mental subnormality in Northern Ireland was carried out on lines similar to an earlier investigation by MacKay (1971). In a general population of one and a half million there were 6,854 ascertained subnormal individuals. The male : female ratio was 1. 14 :1. Approximately one in three subnormal people was under residential care. The prevalence of severe subnormality (IQ less than 50) in the 15-19 year old group was 4.81. The findings do not support the "steady rate" theory of severe subnormality.
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