title: The prevalence of mental retardation (MR) in Kurume City.
abstract: For the purpose of early detection and intervention in mentally handicapped children, the mental retardation (MR) Monitoring Research Committee in Japan initiated a survey in 1981 to determine the prevalence rate and etiology of MR children who had been born between 1969 and 1974, that's those currently from 7 to 12 years of age, living in Kurume City. We found 154 MR children, and that the prevalence ratios in each year group ranged from 5.7/1,000 to 8.1/1,000. The mean prevalence of MR out of all children in each age year group was 7.1/1,000. Of the 154 MR children, 109 were males (9.8/1,000) and 45 females (4.3/1,000), giving a male excess ratio of 2.4:1. The sex difference was significant (p less than 0.005).
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000453:epidemiology*; D007564:Japan; D008297:Male; D012737:Sex Factors