In order to find out the awareness of parents on the causes of their mentally retarded children, a survey with questionnaire was carried out with 487 parents whose children are attending 7 special schools, from September 1st to 30th, 1982.
The following results were obtained.
Ⅰ. Of 487 children studied, male was 310 and female was 177.
Ⅱ. I.Q of the children studied were classified as; custodial 4.7%, trainable 38.4%, educable 40.8% and unknown or unmeasurable 16.2% respectively.
Ⅲ. Parity distribution of the 487 children studied were first 34.7%, second 25.3%, third 17.7% and over 4th 22.4% respectively.
Ⅳ.Onset periods of mental retardation responded by parents studied were: hereditary 12.7%, fetal age 10.3%, at delivery 24.2%, infant age 21.4%, child age 11.0% and unknown 20.4% respectively.
Ⅴ.Of 487 children studied, Down´s syndrome was 12.7%. Relative risk of Down´s syndrome was increased by age: 15-19 age group 0.00, 20-24 age group 0.20. 25-29 age group 0.61, 30-40 age group 0.82 and over-35 age group 2.75 respectively.
Ⅵ. Of 487 parents studied, 10.3% responded that their children´s mental retardation was occured in fetal age and the causes they responded were: medication 36.0%, eclamsia 28.0%, CO poisoning 8.0%, cardiac disease 8.0%, fainting 8.0%, infection 2.0%, others 10.0% respectively.
Ⅶ. Of 487 parents studied, 24.2% responded that their children´s mental retardation was occured at delivery. Under-weight baby was 7.0% and the baby delivered by disturbed delivery was 17.2%.
Ⅷ. Of 487 parents studied, 21.4% responded that the causes of their children´s mental retardation was occured in infant age and the causes they responded were: convulsion 34.6%, febrile disease 25.0%, meningitis 10.6%, measles 10.6%, jaundice 4.8%, medication 3.8%, brain under-development 3.8%, encephalitis 1.9%, Co poisoning 1.9% and others 2.9% respectively.
Ⅸ. Of 487 parents studied, 11.0% responded that the causes of their children´s mental retardation was occurred in child age and the causes they responded were: convaulsion 44.4%, meningitis 20.4% febrile disease 13.0%, measles 9.5%, encephalitis 7.4%, trauma or accident 3.7% and other 1.9% respectively.
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