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For the purpose of comparing and analyzing the characteristies of physical development between educable mentally Retarded children(I.Q from 50 to 75), and Healthy children, on the basic of physical measurement, by using a Total of 784 mentally Retarded children(385 boys, 399 girls), and 1,107 Healthy children(548 boys, 559 girls) at ages from 9 yrs to 19 yrs: depending on the degree of growth, characteristics of the development curve, and the degree of correlation between physical Growth and the Health index. The physical growth and development: is seen as the result of analyzing by height, body weight, chest circumference and sitting height of specific age groups, generally: the mentally Retarded children were found to be slightly smaller than the Healthy groups: especially, there was a significant difference in the two groups in the secondary rapid growth period(P<0.01), such that this growth was stopped earlier in the mentally retarded group. Health index, the relative body weight increased by ago and the mentally Retarded group showed a low index: especially there was a very significant difference between the two groups in the ages of 13 to 16 in the case of boys, and 11 yrs to 14 yrs in the case of girls(P<0.01) in the case of the relative chest circumference index, the boys measurement crossed at 15 yrs, and after this 15 yrs, period, the mentally retarded groups showed the higher index, there were no increases by age: and in the case of girls, the mentally retarded group had the higher index. In relative sitting height index, the mentally retarded groups were superior to the healthy groups from 9 yrs to 19 yrs. The Rohrer index, kaup index, vervaeck index, and obesite index: which shows the state of nourishment: showed a lower index in the groups of the mentally retarded than in the healthy groups, but the difference was not nearly significant. The correlation between physical growth and health index: shows a high correlation in relative weight, kaup index, obesity index, and Rohrer index in this order: and the results are the same for both male and female. Synthesizing from above, the mentally retarded group shows a low physical growth and a slightly different physical development: but in health index: especially, the nutrition index shows differences which are not significant.
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