| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 13 - 19 hours | (10) |
| 19 - 27 hours | (341) |
| 27 - 38 hours | (3921) |
| 38 - 55 hours | (3431) |
| 55 - 78 hours | (593) |
| 78 - 111 hours | (84) |
| 111 - 159 hours | (40) |
| 159 - 226 hours | (11) |
| 226 - 322 hours | (2) |
| 322 - 458 hours | (1) |
| 458 - 652 hours | (1) |
| 652 - 928 hours | (1) |