| Maternal Age at Delivery | Risk at Term |
| 32 | 1/725 |
| 33 | 1/592 |
| 34 | 1/465 |
| 35 | 1/365 |
| 36 | 1/287 |
| 37 | 1/255 |
| 38 | 1/177 |
| 39 | 1/139 |
| 40 | 1/109 |
| 41 | 1/85 |
| 42 | 1/67 |
| 43 | 1/53 |
| 44 | 1/41 |
| 45 | 1/32 |
| 46 | 1/25 |
| 47 | 1/20 |
| 48 | 1/16 |
| 49 | 1/12 |
OB/GYN Secrets
by Helen L. Frederickson, M.D. & Louise Wilkins-Haug, M.D. Ph.D.
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