Table 2.
Baseline characteristics of study participants (n=7,741)
| Variable | Entire Cohort (N=7,741) | Neonatal Composite Morbidity (n=104) | No Neonatal Composite Morbidity (n=7,637) | * P |
|---|---|---|---|---|
| Maternal age, years | 25.7 ± 5.9 | 25.9 ± 6.7 | 25.7 ± 5.9 | 0.78 |
| Race | ||||
| African American | 5053 (68.9) | 65 (64.4) | 4988 (68.9) | 0.59 |
| Caucasian | 1732 (23.6) | 28 (27.7) | 1704 (23.6) | |
| Hispanic | 551 (7.5) | 8 (7.9) | 543 (7.5) | |
| Body mass index, Kg/m2 | 32.3 ± 7.5 | 34.5 ± 8.2 | 32.3 ± 7.5 | <0.01 |
| Epidural | 6952 (89.8) | 93 (89.4) | 6859 (89.8) | 0.90 |
| Nulliparous | 2535 (32.8) | 48 (46.2) | 3487 (32.6) | <0.01 |
| Smoking | 1074 (13.9) | 16 (15.4) | 1058 (13.9) | 0.65 |
| Alcohol | 86 (1.1) | 3 (2.9) | 83 (1.1) | 0.11 |
| Chronic hypertension | 369 (4.8) | 10 (9.6) | 359 (4.8) | 0.02 |
| Diabetes | 358 (4.6) | 10 (9.6) | 348 (4.6) | 0.02 |
| Mode of delivery | ||||
| Spontaneous vaginal | 5996 (77.5) | 46 (44.2) | 5950 (77.9) | <0.01 |
| Operative vaginal | 372 (4.8) | 6 (5.8) | 366 (4.8) | |
| Cesarean | 1373 (17.7) | 52 (50.0) | 1321 (17.3) | |
| Gestational age, weeks | 39.2 ± 1.2 | 39.2 ± 1.3 | 39.2 ± 1.2 | 0.76 |
| Birth weight, grams | 3250 ± 464 | 3275 ± 516 | 3250 ± 463 | 0.58 |
| Small for gestational age | 1046 (13.5) | 17 (16.4) | 1029 (13.5) | 0.40 |
| Male infant | 4022 (52.0) | 65 (62.5) | 3957 (51.8) | 0.10 |
BMI, body mass index; SD, standard deviation.
Data are mean±standard deviation or n (%) unless otherwise specified.
*
P-values based on the Student’s t test for continuous variables and the chi-square or Fisher’s exact test for categorical variables.