| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 9 - 11 hours | (2) |
| 11 - 14 hours | (2) |
| 14 - 17 hours | (10) |
| 17 - 21 hours | (16) |
| 21 - 27 hours | (58) |
| 27 - 33 hours | (94) |
| 33 - 40 hours | (59) |
| 40 - 50 hours | (31) |
| 50 - 62 hours | (9) |
| 62 - 76 hours | (2) |
| 76 - 93 hours | (0) |
| 93 - 115 hours | (1) |