title: Similarities of Negro and Caucasian fetal extremity lengths in the interval from 9 to 20 weeks of pregnancy.
abstract: Foot, leg, and arm measurements were compared from 599 electively aborted fetuses of Negro and Caucasian women who had reliable menstrual dates and agreement between dates and uterine size. When compared by week, no significant racial differences were detected in the means of any of these measurements between 9 and 20 menstrual weeks of pregnancy. The combined, corrected data provided smoother curves than those previously published. The following formulas are recommended for weeks 9 to 20 of pregnancy, where W = weeks and F, L, and A are the foot, leg, and arm measurements in centimeters: W = 4.5261 + 11.937(F) - 4.4895(F2) + 0.71583(F3); W = 5.9957 + 5.7279(L) - 1.2246(L2) + 0.11880(L3); W = 5.4007 + 5.0305(A) - 0.93540(A2) + 0.079022(A3).
mesh_terms: D044383:Black People; D005314:Embryonic and Fetal Development; D005121:Extremities / Q000196:embryology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D044465:White People