Estimated likelihood of having a baby with Down's syndrome
|
Mother’s Age
(at expected date of delivery)
|
Probability of baby with
Down’s syndrome
|
|
Mother’s Age
(at expected date of delivery)
|
Probability of baby with
Down’s syndrome
|
| 15 |
1 in 1578 |
34 |
1 in 474 |
| 16 |
1 in 1572 |
35 |
1 in 384 |
| 17 |
1 in 1565 |
36 |
1 in 307 |
| 18 |
1 in 1556 |
37 |
1 in 242 |
| 19 |
1 in 1544 |
38 |
1 in 189 |
| 20 |
1 in 1528 |
39 |
1 in 146 |
| 21 |
1 in 1507 |
40 |
1 in 112 |
| 22 |
1 in 1481 |
41 |
1 in 85 |
| 23 |
1 in 1447 |
42 |
1 in 65 |
| 24 |
1 in 1404 |
43 |
1 in 49 |
| 25 |
1 in 1351 |
44 |
1 in 37 |
| 26 |
1 in 1286 |
45 |
1 in 28 |
| 27 |
1 in 1208 |
46 |
1 in 21 |
| 28 |
1 in 1119 |
47 |
1 in 15 |
| 29 |
1 in 1018 |
48 |
1 in 11 |
| 30 |
1 in 909 |
49 |
1 in 8 |
| 31 |
1 in 796 |
50 |
1 in 6 |
| 33 |
1 in 574 |
|
|
Source: St Bartholomews Hospital, London, (Wolfson Institute)