The frequency of the fragile X chromosome among schoolchildren in Coventry.
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.
D000293:Adolescent; D002648:Child; D004739:England; D005600:Fragile X Syndrome / Q000453:epidemiology*; D005787:Gene Frequency; D006801:Humans; D012729:Sex Chromosome Aberrations / Q000453:epidemiology*; D014505:Urban Population