Table 6 . Univariate and multivariate analysis of birth weight and failed VBAC .
| Birth weight (kg) | Failed VBAC n (%) | OR | 95%CI | P value | Adjusted OR* | 95%CI | P value |
| <1.50 (n=54) | 29 (53.7) | 1.853 | 1.078-3.183 | 0.026 | 6.813 | 3.331-13.935 | <0.001 |
| 1.50-1.99 (n=71) | 34 (47.9) | 1.464 | 0.912-2.349 | 0.114 | 2.727 | 0.985-6.827 | 0.081 |
| 2.00-2.49 (n=132) | 38 (28.8) | 0.622 | 0.423-0.914 | 0.016 | 0.629 | 0.403-0.982 | 0.042 |
| 2.50-2.99 (n=534) | 88 (16.5) | 0.241 | 0.189-0.308 | <0.001 | 0.288 | 0.223-0.370 | <0.001 |
| 3.00-3.49 (n=964) | 284 (29.5) | 0.514 | 0.433-0.610 | <0.001 | 0.450 | 0.375-0.541 | <0.001 |
| 3.50-3.99 (n=545) | 361 (66.2) | 4.350 | 3.554-5.324 | <0.001 | 4.025 | 3.248-4.990 | <0.001 |
| ≥4.00 (n=172) | 126 (73.3) | 4.815 | 3.399-6.820 | <0.001 | 3.898 | 2.776-5.732 | <0.001 |
| *Adjusted for maternal age, gravidity, parity, antenatal visits and gestational age at delivery | |||||||