| Doubling Time | Number of Pregnancies in this range |
|---|---|
| 15 - 21 hours | (2) |
| 21 - 28 hours | (10) |
| 28 - 38 hours | (129) |
| 38 - 51 hours | (459) |
| 51 - 69 hours | (312) |
| 69 - 93 hours | (137) |
| 93 - 125 hours | (33) |
| 125 - 169 hours | (6) |
| 169 - 228 hours | (2) |
| 228 - 307 hours | (2) |
| 307 - 414 hours | (3) |
| 414 - 558 hours | (1) |