The prevalence of mental retardation (MR) in Kurume City.
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).
D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000453:epidemiology*; D007564:Japan; D008297:Male; D012737:Sex Factors