TABLE.
Predicted probability of delivery before week 32 by cervical length (millimeters) and gestational age in weeks at time of measurement
| Cervical length, mm |
Week of pregnancy | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | |
| 0 | 76.3 | 73.7 | 70.9 | 67.9 | 64.7 | 61.4 | 58.0 | 54.5 | 51.0 | 47.5 | 44.0 | 40.5 | 37.2 | 33.9 |
| 5 | 67.9 | 64.8 | 61.5 | 58.1 | 54.6 | 51.1 | 47.6 | 44.0 | 40.6 | 37.2 | 34.0 | 30.9 | 28.0 | 25.2 |
| 10 | 58.1 | 54.7 | 51.2 | 47.6 | 44.1 | 40.7 | 37.3 | 34.1 | 31.0 | 28.0 | 25.3 | 22.7 | 20.3 | 18.1 |
| 15 | 47.7 | 44.2 | 40.7 | 37.4 | 34.1 | 31.0 | 28.1 | 25.3 | 22.7 | 20.4 | 18.2 | 16.2 | 14.3 | 12.7 |
| 20 | 37.4 | 34.2 | 31.1 | 28.1 | 25.4 | 22.8 | 20.4 | 18.2 | 16.2 | 14.4 | 12.7 | 11.2 | 9.9 | 8.7 |
| 25 | 28.2 | 25.4 | 22.8 | 20.4 | 18.2 | 16.2 | 14.4 | 12.7 | 11.3 | 9.9 | 8.7 | 7.7 | 6.7 | 5.9 |
| 30 | 20.5 | 18.3 | 16.3 | 14.4 | 12.8 | 11.3 | 9.9 | 8.7 | 7.7 | 6.7 | 5.9 | 5.2 | 4.5 | 3.9 |
| 35 | 14.5 | 12.8 | 11.3 | 10.0 | 8.8 | 7.7 | 6.8 | 5.9 | 5.2 | 4.5 | 4.0 | 3.5 | 3.0 | 2.6 |
| 40 | 10.0 | 8.8 | 7.7 | 6.8 | 5.9 | 5.2 | 4.5 | 4.0 | 3.5 | 3.0 | 2.6 | 2.3 | 2.0 | 1.7 |
| 45 | 6.8 | 5.9 | 5.2 | 4.5 | 3.9 | 3.4 | 3.0 | 2.6 | 2.3 | 2.0 | 1.7 | 1.5 | 1.3 | 1.1 |
| 50 | 4.6 | 4.0 | 3.5 | 3.0 | 2.6 | 2.3 | 2.0 | 1.7 | 1.5 | 1.3 | 1.2 | 1.0 | 0.9 | 0.8 |
| 55 | 3.0 | 2.7 | 2.3 | 2.0 | 1.8 | 1.5 | 1.3 | 1.2 | 1.0 | 0.9 | 0.8 | 0.7 | 0.6 | 0.5 |
| 60 | 2.0 | 1.8 | 1.5 | 1.3 | 1.2 | 1.0 | 0.9 | 0.8 | 0.7 | 0.6 | 0.5 | 0.4 | 0.4 | 0.3 |
Reproduced, with permission, from Berghella et al.59