Who is affected by Down syndromeDown syndrome occurs in all cultures, ethnic groups,
socio-economic levels, and geographic locations. - Trisomy 21 is the most common type of Down syndrome, accounting for
about 95% of all cases.1
- The risk of a
20-year-old woman having a baby with trisomy 21-type Down syndrome is 1 in
about 2,000. By age 45, a woman's risk for having a child with this type of
Down syndrome is 1 in 20.2
| | Author: | Debby Golonka, MPH
Ralph Poore | Last Updated: October 4, 2007 | | Medical Review: | Adam Husney, MD - Family Medicine
Michael J. Sexton, MD - Pediatrics
Donald Sproule, MD, CM, CCFP, FCFP - Family Medicine |
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