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Research Article
The frequency of the fragile X chromosome among schoolchildren in Coventry.
  1. T P Webb,
  2. S Bundey,
  3. A Thake,
  4. J Todd

    Abstract

    A population study has been carried out among schoolchildren in the City of Coventry in order to ascertain the frequency of mental retardation associated with the fragile X chromosome. The prevalence of the fragile X mental retardation syndrome in the 11 to 16 year age group (the age of greatest ascertainment) was about 1.0 per 1,000 and therefore indicates that the syndrome is a major cause of mental retardation.

    https://doi.org/10.1136/jmg.23.5.396

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