Frequency of Down Syndrome Per Maternal Age

Age (years) Frequency of Fetuses with DownSyndrome to Normal Fetusesat 16 weeks of pregnancy Frequency of Live Births ofBabies with Down Syndrometo Normal Births 15 - 19 ---- 1 / 1250 20 - 24 ---- 1 / 1400 25 - 29 ---- 1 / 1100 30 - 31 ---- 1 / 900 32 ---- 1 / 750 33 1 / 420 1 / 625 34 1 / 325 1 / 500 35 1 / 250 1 / 350 36 1 / 200 1 / 275 37 1 / 150 1 / 225 38 1 / 120 1 / 175...

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