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  • Title: The prevalence of severe mental handicap in Northern Ireland.
    Author: Mallon JR, MacKay DN, McDonald G, Wilson R.
    Journal: J Ment Defic Res; 1991 Feb; 35 ( Pt 1)():66-72. PubMed ID: 1828087.
    Abstract:
    There are four administrative areas (Health and Social Services Boards) in Northern Ireland. Two prevalence surveys, carried out several years apart, show that there is a significant geographical gradient in the rates of severe mental handicap (IQ less than 50). The rates in the 20-29-year-old groups in the Eastern and Northern Boards range between 4.07 and 4.82 per thousand; comparable rates in the Southern and Western Boards range between 5.17 and 6.37. A similar gradient was discernible in the distribution of Down's syndrome.
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