Down syndrome risk increases slightly with age up to 31 years old, and more rapidly to age 40, increasing from about 0.1% to about 1%. The variation of displayed risk between the United States, the predicted risk, and that observed in England and Wales is not statistically significant. Data from England and Wales and the predicted risk are from[1] while the United States data is from[2]. Predicted risk=1/(1+exp(7.330-4.211/(1+exp(-0.282x(age-37.23)))))
Own work
Delphi234