Male to female ratio in newborns of grand grand multiparous women.
The male to female ratio in newborns of grand grand multiparous women was evaluated in 569 Jewish Orthodox women and 28 Muslim women. A total of 882 babies was born on the > or = 10th delivery; 460 (52.2%) were males and 422 (47.8%) were females (sex ratio = 1.06). Newborn sex ratio did not significantly change with respect to birth order or maternal age. It is suggested that parity and increasing maternal age do not affect the sex ratio of newborns and that ethnic and environmental variables may play a role in the deviations in offspring sex ratio observed among different populations.
Department of Obstetrics and Gynecology, Bikur Cholim Hospital, Jerusalem, Israel.
M
M
Almagor
P
P
Schwed
H
H
Yaffe
D000328:Adult; D001722:Birth Order; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007514:Islam; D007557:Israel; D007585:Jews; D008297:Male; D008423:Maternal Age; D008875:Middle Aged; D010298:Parity; D011247:Pregnancy; D018566:Pregnancy, High-Risk; D012744:Sex Ratio