| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 11 - 14 hours | (2) |
| 14 - 17 hours | (1) |
| 17 - 22 hours | (14) |
| 22 - 27 hours | (77) |
| 27 - 34 hours | (592) |
| 34 - 42 hours | (1144) |
| 42 - 52 hours | (666) |
| 52 - 65 hours | (172) |
| 65 - 81 hours | (52) |
| 81 - 101 hours | (10) |
| 101 - 126 hours | (4) |
| 126 - 157 hours | (2) |