TABLE 1.
Maternal characteristics
| Variable | <90th percentile (n = 4534) | 90th–94th percentile (n = 251) | 95th–96th percentile (n = 102) | ≥97th percentile (n = 143) | P value |
|---|---|---|---|---|---|
| Age, y | 24.7 ± 5.9 | 24.5 ± 5.9 | 24.6 ± 5.5 | 25.0 ± 6.0 | .86 |
| Nulliparous | 1790 (39.5%) | 102 (40.6%) | 39 (38.2%) | 59 (41.3%) | .94 |
| Race | .04 | ||||
| Black | 3298 (72.7%) | 185 (73.7%) | 80 (78.4%) | 100 (69.9%) | |
| White | 749 (17.0%) | 45 (17.9%) | 16 (15.7%) | 35 (34.5%) | |
| Hispanic | 292 (6.4%) | 14 (5.6%) | 4 (3.9%) | 3 (2.1%) | |
| Insurance | .10 | ||||
| Private | 644 (14.2%) | 24 (9.6%) | 10 (9.8%) | 23 (16.1%) | |
| Public | 3890 (85.8%) | 227 (90.4%) | 92 (90.2%) | 120 (83.9%) | |
| Obese (BMI ≥ 30 kg/m2) | 2295 (52.5%) | 152 (62.0%) | 62 (61.4%) | 88 (62.4%) | < .01 |
| Hypertension | 112 (2.5%) | 5 (2.0%) | 5 (4.9%) | 7 (4.9%) | .12 |
| Preeclampsia | 298 (6.6%) | 14 (5.6%) | 10 (9.8%) | 8 (5.6%) | .50 |
| Diabetes | 46 (1.0%) | 8 (3.2%) | 0 | 6 (4.2%) | < .01 |
| Induced | 1397 (43.1%) | 77 (78.6%) | 32 (88.9%) | 43 (82.1%) | < .01 |
| Received oxytocin | 2375 (52.4%) | 216 (86.1%) | 91 (89.2%) | 122 (85.3%) | < .01 |
| Birthweight | 3229 ± 522 | 3375 ± 571 | 3349 ± 553 | 3440 ± 719 | < .01 |
| Macrosomia | 221 (4.96%) | 26 (10.4%) | 9 (8.8%) | 21 (14.7%) | < .01 |
BMI, body mass index.