| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 11 - 15 hours | (3) |
| 15 - 20 hours | (3) |
| 20 - 26 hours | (14) |
| 26 - 35 hours | (177) |
| 35 - 46 hours | (670) |
| 46 - 61 hours | (477) |
| 61 - 81 hours | (136) |
| 81 - 107 hours | (33) |
| 107 - 142 hours | (3) |
| 142 - 188 hours | (0) |
| 188 - 249 hours | (0) |
| 249 - 329 hours | (2) |