Likelihood of Down Syndrome Increases with Maternal Age

	1
20	0.05
21	0.059
22	0.067
23	0.071
24	0.077
25	0.083
26	0.091
27	0.095
28	0.1
29	0.105
30	0.111
31	0.125
32	0.139
33	0.167
35	0.286
36	0.333
37	0.4
38	0.5
39	0.667
40	1
41	1.25
42	1.429
43	2
44	2.5
45	3.333
46	4
47	5
48	6.667
49	10

Maternal Age

Incidence of Down syndrome (%)

Sources: ndss.org