Definition of ROM | Rate of CD early ROM | Rate of CD late ROM | p-Value |
Modified Bishop score All women (N = 279) Nulliparous (N = 133) Multiparous (N = 146) | <5 32% (16/50) 60% (12/20) 13.3% (4/30) | ≥5 17.5% (40/229) 27.4% (17/229) 7.8% (9/116) |
0.031 0.008 0.469 |
Cervical dilation All women (N = 279) Nulliparous (N = 133) Multiparous (N = 146) | <4 cm 32.4% (12/37) 38.1% (8/21) 25% (4/16) | ≥4 cm 18.2% (44/242) 31.3% (35/112) 6.9% (9/130) |
0.049 0.613 0.038 |
Cervical effacement All women (N = 279) Nulliparous (N = 133) Multiparous (N = 146) | <80% 33.3% (26/78) 62.1% (18/29) 16.3% (8/49) | ≥80% 14.9% (30/201) 24% (25/104) 5.2% (5/97) |
0.001 <0.0001 0.033 |