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Mental subnormality in Northern Ireland.

G McDonald, D N MacKay

    Journal of Mental Deficiency Research
    |June 1, 1978
    PubMed
    Summary

    This study surveyed mental subnormality in Northern Ireland, finding 6,854 individuals affected. The prevalence of severe subnormality does not support the "steady rate" theory.

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    Area of Science:

    • Public Health
    • Epidemiology
    • Psychiatry

    Background:

    • Mental subnormality prevalence studies are crucial for resource allocation and understanding population health.
    • Previous research, like MacKay (1971), established baseline data for such investigations.

    Purpose of the Study:

    • To conduct a prevalence survey of mental subnormality in Northern Ireland.
    • To compare findings with earlier epidemiological studies on intellectual disability.

    Main Methods:

    • A population-based survey was conducted across Northern Ireland.
    • Ascertainment of subnormal individuals was performed using defined criteria.
    • Prevalence rates, including severe subnormality (IQ < 50), were calculated for different age groups.

    Main Results:

    • 6,854 subnormal individuals were identified in a population of 1.5 million.
    • The male to female ratio was 1.14:1.
    • The prevalence of severe subnormality in the 15-19 year old group was 4.81 per 1,000.
    • One-third of subnormal individuals were in residential care.

    Conclusions:

    • The study provides current prevalence data for mental subnormality in Northern Ireland.
    • Findings challenge the "steady rate" theory regarding the prevalence of severe subnormality.
    • Data can inform public health policies and service planning for individuals with intellectual disabilities.

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