| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 11 - 15 hours | (5) |
| 15 - 22 hours | (62) |
| 22 - 31 hours | (615) |
| 31 - 44 hours | (890) |
| 44 - 63 hours | (347) |
| 63 - 89 hours | (108) |
| 89 - 127 hours | (32) |
| 127 - 180 hours | (14) |
| 180 - 256 hours | (5) |
| 256 - 363 hours | (1) |
| 363 - 515 hours | (3) |
| 515 - 731 hours | (3) |