| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 15 - 20 hours | (4) |
| 20 - 27 hours | (15) |
| 27 - 37 hours | (181) |
| 37 - 49 hours | (612) |
| 49 - 66 hours | (519) |
| 66 - 89 hours | (236) |
| 89 - 119 hours | (56) |
| 119 - 159 hours | (27) |
| 159 - 213 hours | (11) |
| 213 - 284 hours | (6) |
| 284 - 380 hours | (1) |
| 380 - 508 hours | (1) |