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Prevalence

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The prevalence of mental retardation with a diagnostic cytogenetic picture of fragile X is:

  • 1:1250 liveborn males
  • 1:2500 liveborn females

This compares with 1:600 for Downs and 1:2000 for cystic fibrosis.

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