Table 1 Demographic characteristics of women undergoing trial of labor after cesarean delivery
Demographic characteristic | Successful VBAC (n = 367) | Failed VBAC (n = 152) | P |
|---|---|---|---|
Maternal age (y) | 27.8 ± 4.9 | 35.6 ± 4.9 | .011 |
Gestational age at delivery (wk) | 38.8 ± 1.7 | 38.5 ± 1.9 | .65 |
 35–38 (wk) | 198 (53.9) | 77 (50.7) |  |
 38–40 (wk) | 169 (46.1) | 75 (49.3) |  |
Weigh Gain During Pregnancy | <.001 | ||
 Less than 15 kg | 19 (5.1) | 15 (9.6) |  |
 15–20 kg | 292 (79.8) | 95 (62.3) |  |
 More than 20 kg | 56 (15.1) | 42 (28.1) |  |
Marital status | .37 | ||
 Married | 342 (93.2) | 143 (94.1) |  |
 Single | 13 (3.4) | 3 (1.9) |  |
 Divorced or separated | 6 (1.7) | 3 (1.9) |  |
 Unknown | 6 (1.7) | 3 (1.9) |  |
History of vaginal delivery | 143 (38.9) | 29 (19.2) | <.001 |
Previous indication for primary cesarean delivery | 37 (10.1) | 41 (26.9) | <.001 |
Induction of labor | 80 (22.0) | 114 (75.0) | .019 |
Maternal preeclampsia or eclampsia | 12 (3.4) | 6 (3.8) | .69 |
Maternal gestational diabetes | 18 (5.1) | 9 (5.7) | .21 |
Small-for-gestational-age neonate | 12 (3.4) | 6 (3.8) | .73 |
Pelvic measurement (cm) | |||
 Sacral shame external diameter | 19.3 ± 1.4 | 17.4 ± 1.5 | .042 |
 Diagonal conjugate | 13.4 ± 0.7 | 11.5 ± 0.8 | .043 |
 Transverse outlet | 9.5 ± 0.4 | 7.9 ± 0.4 | .039 |
 Posterior sagittal diameter of pelvic outlet | 17.7 ± 1.5 | 14.8 ± 1.6 | .022 |
 Anteroposterior diameter of pelvic outlet | 12.6 ± 0.8 | 10.7 ± 0.6 | .039 |
Estimated prenatal fetal weight (g) | 3108 ± 466 | 3759 ± 521 | .042 |