title: Familial variation of head size and adjustment for parental head circumference.
abstract: Occipitofrontal head circumference was measured on 122 twin pairs, their spouses, and their children. These data indicate that approximately 50% of normal head size variation is familial. Because of the relationship between the head size of normal children and their parents, adjustment of a child's head size value by the average parental value permits better definition of the range of normalcy. A method is presented that will allow physicians to make this adjustment, providing a more refined assessment of head size when there is a suspected abnormality.
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D002648:Child; D002675:Child, Preschool; D005190:Family; D005260:Female; D006257:Head / Q000033:anatomy & histology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010375:Pedigree; D011247:Pregnancy; D012016:Reference Values; D012737:Sex Factors; D014430:Twins, Monozygotic