Prevalences of mental retardation
F. M. Sorel
Broschiertes Buch

Prevalences of mental retardation

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1.1. GENERAL The study of the prevalence of mental retardation presented in this book is especially concerned with assessing the prevalence within a number of age groups in the city of Amsterdam, i.e. in the groups of 10 and 13 year-olds - who together are called the children - and those of 16, 19, 25, 34, 40 and 50 years old-together called the older pupils. This study is to be seen as that part of the report the National Survey of the Mentally Handicapped which took place in Amsterdam in the years 1966-1968. The problems to be investigated were as follows: 1. How many mentally retarded are t...