Definition of ROM | Rate of CC with early ROM | Rate of CC with late ROM | p-Value |
Modified Bishop score All women (N = 279) Nulliparous (N = 133) Multiparous (N = 146) | <5 14% (7/50) 25% (5/20) 6.7% (2/30) | ≥5 7.4% (17/229) 11.5% (13/113) 3.5% (4/116) |
0.161 0.148 0.603 |
Cervical dilation All women (N = 279) Nulliparous (N = 133) Multiparous (N = 146) | <4 cm 5.4% (2/37) 4.7% (1/21) 6.3% (1/16) | ≥4 cm 9.1% (22/242) 15.2% (17/112) 3.9% (5/130) |
0.752 0.304 0.508 |
Cervical effacement All women (N = 279) Nulliparous (N = 133) Multiparous (N = 146) | <80% 15.4% (12/78) 27.6% (8/29) 8.2% (4/49) | ≥80% 6% (12/201) 9.6% (10/104) 2% (2/98) |
0.017 0.027 0.095 |