Incidence of Down syndrome and maternal age
Maternal
age
lncidence of
Down syndrome
Maternal
age
Incidene of
Down syndrome
20
1 in 2000
35
1 in 350
21
1 in 1700
36
1 in 300
22
1 in 1500
37
1 in 250
23
1 in 1400
38
1 in 200
24
1 in 1300
39
1 in 150
25
1 in 1200
40
1 in 100
26
1 in 1100
41
1 in 80
27
1 in 1050
42
1 in 70
28
1 in 1000
43
1 in 50
29
1 in 950
44
1 in 40
30
1 in 900
45
1 in 30
31
1 in 800
46
1 in 25
32
1 in 720
47
1 in 20
33
1 in 600
48
1 in 15
34
1 in 450
49
1 in 10

Fetal Medicine Foundation (Screening for Trisomy 21) 다운 증후군
↑ ~100 invasive tests to identify one affected fetus

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