Enter the age of the mother at the time of delivery: years.

REFERENCES:
California Prenatal Screening Program Handbook 2023
https://www.cdph.ca.gov/Programs/CFH/DGDS/CDPH%20Document%20Library/PNS%20Documents/Provider_Handbook_Appendix_D.pdf
ACCESSED 4/6/2023
1 Morris JK et al.: Revised estimates of the maternal age specific live birth prevalence of Down Syndrome, J Med 2002; 9:2-6 
2 Hook, K.B.: Chromosome abnormalities and spontaneous fetal deaths following amniocentesis; further data and associations with maternal age Am J Hum Genet 1983 35:110-116. 
3 Hook, B.B., Cross, PK., Schrelnemachers, D,M,: Chromosomal abnormality rates at amniocentesis and live‐born Infants J Am Med Assoc 1983, 249: 2034-2038