Table 1.
Demographics of Study Population
| Characteristica,b | Successful TOLAC N=243 |
Failed TOLAC N=126 |
P valuec |
|---|---|---|---|
| Maternal age (years) | 29.5 (5.7) | 29.6 (5.3) | 0.85 |
| Pre-pregnancy BMI (kg/m2)d | 27.0 (26.3, 27.8) | 28.7 (27.5, 30.0) | 0.02 |
| Years since last cesarean | 4.0 (3.6, 4.5) | 3.5 (3.1, 4.0) | 0.11 |
| Race | |||
| African American | 127 (52.3) | 63 (50.0) | 0.86 |
| Caucasian | 85 (35.0) | 43 (34.1) | |
| Hispanic | 22 (9.1) | 15 (11.9) | |
| Other | 9 (3.7) | 5 (4.0) | |
| Recurring indication for either first or second cesarean | 103(42.4) | 79 (62.7) | <0.001 |
| Previous vaginal delivery | 154 (63.6) | 33 (26.2) | <0.001 |
| Previous vaginal birth after cesarean | 117 (52.9) | 24 (19.7) | <0.001 |
| Pre-existing diabetes mellitus | 7 (2.9) | 10 (7.9) | 0.04 |
| Other chronic medical conditione | 27 (11.1) | 16 (12.7) | 0.73 |
| Neonatal birth weight (grams) | 3291 (3232, 3351) | 3462 (3359, 3567) | 0.01 |
| Gestational age at delivery (days) | 276 (9) | 277 (10) | 0.17 |
TOLAC = trial of labor after cesarean
Number (%) reported for categorical variables
Mean with standard deviation or geometric mean and 95% geometric confidence interval reported for continuous variables
P-values from either exact Pearson chi-square for categorical measures or unequal-variance-two-sample-t-test (on the log scale if reporting geometric mean) for continuous measures
Pre-pregnancy body mass index (BMI) was imputed based on admission BMI and neonatal birth weight for n=105 of the successful TOLAC participants and n=49 of the failed TOLAC participants
Other chronic medical conditions included: chronic hypertension, other chronic cardiac disease, chronic renal disease, asthma, or connective tissue disorder