| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 12 - 13 hours | (2) |
| 13 - 15 hours | (3) |
| 15 - 16 hours | (1) |
| 16 - 19 hours | (0) |
| 19 - 21 hours | (2) |
| 21 - 24 hours | (3) |
| 24 - 26 hours | (2) |
| 26 - 30 hours | (1) |
| 30 - 33 hours | (0) |
| 33 - 38 hours | (1) |
| 38 - 42 hours | (1) |
| 42 - 48 hours | (1) |