In a review of 202 microcephalic children evaluated at a child development center, from 7.5% to 13.5% were developing normally. More than half of these children, while not retarded, had evidence of brain damage or dysfunction. These 27 children are described. The variability in anthropometric studies is reviewed.
Martin HP. Microcephaly and Mental Retardation. Am J Dis Child. 1970;119(2):128-131. doi:10.1001/archpedi.1970.02100050130007