| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 9 - 10 hours | (1) |
| 10 - 12 hours | (2) |
| 12 - 13 hours | (0) |
| 13 - 15 hours | (1) |
| 15 - 18 hours | (5) |
| 18 - 20 hours | (2) |
| 20 - 23 hours | (2) |
| 23 - 26 hours | (0) |
| 26 - 29 hours | (1) |
| 29 - 33 hours | (0) |
| 33 - 38 hours | (1) |
| 38 - 43 hours | (1) |