Trends in Development of Abilities Related to Somatic Growth

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Abstract
From a longitudinal sample of 202 children studied from birth to 8 years of age, two extreme groups were selected. One group had a more rapid development than normal and the other a slower development when tested with Brunét-Lézine and Terman-Merrill tests. From the first measurement occasion at the age of 3 months to the last one at the age of 8 years, the rapid group’s mean change of ability was from 84 DQ to 114 IQ and the slow group’s mean change from 111 DQ to 84 IQ. These groups were then compared with regard to development of weight and height. A relationship between the development of abilities and weight and height increases was found for boys aged 4 weeks to 2 years and between the development of abilities and height increase for girls aged 2–8 years.

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