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Hartlage, Lawrence; And Others – 1983
A longitudinal study of mental development during the first 6 years of life was conducted to determine whether different social and biological variables were related to mental development at different ages. A total of 218 children having complete neonatal records of 12 biological variables were studied at 6-month intervals until the children were…
Descriptors: Age Differences, Biological Influences, Cognitive Development, Correlation
