The male/female ratio of fetal deaths and births in Japan.
The decline in the male/female ratio of births has not yet been explained. In Japan, the male/female ratio of fetal deaths has been increasing since the 1970s, reaching over 2.0 in 1996. The increased male/female ratio of births could explain the decrease In the male/female ratio of births during the past two decades. This trend could suggest the increasing prenatal vulnerability of the male fetus especially at earlier stages of gestation.
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D000022:Abortion, Spontaneous / Q000453:epidemiology; D005260:Female; D005313:Fetal Death / Q000453:epidemiology*; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007564:Japan / Q000453:epidemiology; D008297:Male; D011247:Pregnancy; D012744:Sex Ratio; D014798:Vital Statistics