| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 14 - 20 hours | (2) |
| 20 - 29 hours | (15) |
| 29 - 40 hours | (186) |
| 40 - 57 hours | (646) |
| 57 - 81 hours | (633) |
| 81 - 114 hours | (304) |
| 114 - 162 hours | (89) |
| 162 - 228 hours | (24) |
| 228 - 322 hours | (12) |
| 322 - 455 hours | (6) |
| 455 - 642 hours | (2) |
| 642 - 905 hours | (2) |