| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 15 - 20 hours | (4) |
| 20 - 27 hours | (17) |
| 27 - 37 hours | (197) |
| 37 - 49 hours | (684) |
| 49 - 66 hours | (562) |
| 66 - 89 hours | (270) |
| 89 - 119 hours | (65) |
| 119 - 159 hours | (29) |
| 159 - 213 hours | (12) |
| 213 - 284 hours | (6) |
| 284 - 380 hours | (1) |
| 380 - 508 hours | (1) |