| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 11 - 14 hours | (3) |
| 14 - 19 hours | (4) |
| 19 - 24 hours | (29) |
| 24 - 31 hours | (251) |
| 31 - 41 hours | (1224) |
| 41 - 53 hours | (1088) |
| 53 - 68 hours | (232) |
| 68 - 88 hours | (37) |
| 88 - 114 hours | (6) |
| 114 - 147 hours | (2) |
| 147 - 190 hours | (1) |
| 190 - 245 hours | (1) |