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Study population
| Non-Hispanic Caucasian | Non-Hispanic African-American | |
|---|---|---|
| N | 940 | 413 |
| Maternal age (mean (SD)) | 28.3 (6.1) | 24.0 (5.4) |
| Pregravid BMI (mean (SD)) | 25.1 (6.5) | 27.8 (8.3) |
| Gestational age at birth, median (IQR) | 39.3 (37.7, 40.3) | 38.9 (36.7,40.1) |
