| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 11 - 14 hours | (2) |
| 14 - 17 hours | (2) |
| 17 - 20 hours | (4) |
| 20 - 25 hours | (13) |
| 25 - 30 hours | (106) |
| 30 - 37 hours | (491) |
| 37 - 46 hours | (827) |
| 46 - 56 hours | (523) |
| 56 - 68 hours | (163) |
| 68 - 83 hours | (28) |
| 83 - 101 hours | (13) |
| 101 - 124 hours | (2) |