As medical interventions aimed at prolonging the lives of people with Human Immunodeficiency Virus (HIV) and Acquired Immunodeficiency Syndrome (AIDS) are implemented, HIV/AIDS is evolving into

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(Terman, 1921) showed that the I.Q. for a given child remained remarkably constant, and re-tests during periods of from 2 to 7 years gave similar results. For the purpose of this study the composition of each group was taken to be constant except for minor variations due to school leavers and new entrants.At the beginning of each term a census was taken of all children in attendance in order to minimize the effect of changes in the school population on the calculation of rates per hundred.

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