| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 9 - 12 hours | (2) |
| 12 - 15 hours | (2) |
| 15 - 19 hours | (11) |
| 19 - 24 hours | (43) |
| 24 - 30 hours | (165) |
| 30 - 38 hours | (251) |
| 38 - 49 hours | (159) |
| 49 - 62 hours | (50) |
| 62 - 78 hours | (20) |
| 78 - 98 hours | (2) |
| 98 - 125 hours | (0) |
| 125 - 157 hours | (2) |