| Indications | Cervical length ( cm) | ||||
| <2 | 2 - 2.9 | 3 - 3.9 | ≥4 cm | Total | |
| Failure to progress | 0 | 1 (6%) | 4 (25%) | 11 (69%) | 16 (100%) |
| Failed Induction | 0 | 1 (8%) | 2 (17%) | 9 (75%) | 12 (100%) |
| Fetal distress | 1 (8%) | 1 (8%) | 7 (58%) | 3 (25%) | 12 (100%) |
| Deep transverse arrest/CPD | 0 | 0 | 1 (50%) | 1 (50%) | 2 (100%) |
| Total | 1 (2.3%) | 3 (7.1%) | 14 (33.3%) | 26 (61.9%) | 42 (100%) |