Table 3.
Logistic regression analysis of factors associated with VBAC using the antepartum and intrapartum variables.
| Variables | VBAC | COR (95% CI) | P value | aOR (95% CI) | P value | |
|---|---|---|---|---|---|---|
| Yes | No | |||||
| Parity | 0.012 | 0.466 | ||||
| Primiparous | 95 | 62 | 0.38 (0.17-0.81) | 2.94 (0.16-53.4) | ||
| Multiparous | 91 | 20 | 1 | 1 | ||
| Prior vaginal delivery | 0.006 | 0.357 | ||||
| Yes | 91 | 18 | 3.02 (1.37-6.63) | 4.05 (0.21-79.47) | ||
| No | 95 | 64 | 1 | 1 | ||
| Prior VBAC | 0.001 | ≤0.001 | ||||
| Yes | 71 | 4 | 12.29 (2.83-53.18) | 16.74 (3.99-70.19) | ||
| No | 115 | 78 | 1 | 1 | ||
| Prepregnancy BMI | ≤0.001 | ≤0.001 | ||||
| <25 | 112 | 18 | 5.38 (2.95-9.80) | 11.87 (15.46-28.34) | ||
| ≥25 | 74 | 64 | 1 | 1 | ||
| Membrane status | 0.064 | 0.009 | ||||
| Ruptured | 77 | 44 | 1.64 (0.97-2.77) | 2.67 (1.28-5.57) | ||
| Intact | 109 | 38 | 1 | 1 | ||
| Cervical effacement | 0.044 | 0.360 | ||||
| <50% | 20 | 20 | 0.40 (0.17-0.97) | 0.64 (0.25-1.66) | ||
| ≥50% | 166 | 62 | 1 | 1 | ||
| Fetal station | ≤0.001 | ≤0.001 | ||||
| High (<0) | 101 | 72 | 0.16 (0.06-0.42) | 0.10 (0.04-0.25) | ||
| Low (≥0) | 85 | 10 | 1 | 1 | ||
COR: crude odds ratio; aOR: adjusted odds ratio; BMI: body mass index.