Prenatal mortality of trisomy 21 (Down's syndrome).
D000022:Abortion, Spontaneous / Q000209:etiology; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome; D005260:Female; D005313:Fetal Death / Q000453:epidemiology*; D005865:Gestational Age; D006579:Heterozygote; D006801:Humans; D007621:Karyotyping; D008297:Male; D008423:Maternal Age; D011247:Pregnancy; D012744:Sex Ratio; D014314:Trisomy