Table 1.
Population characteristics.
| Population characteristics | N=712,438 |
|---|---|
| Maternal age, Mean (SD) | 30.08 (5.92) |
| Maternal race, n (%) | |
| White | 512,355 (71.9) |
| Black | 67,435 (9.5) |
| Other | 132,648 (18.6) |
| Maternal education, n (%) | |
| Less than high school | 75,511 (10.6) |
| High school | 158,733 (22.3) |
| Some college | 162,002 (22.7) |
| College or more | 316,192 (44.4) |
| Governmental support for prenatal care, n (%) | 251,633 (35.3) |
| Chronic hypertension, n (%) | 9,073 (1.3) |
| Diabetes mellitus, n (%) | 6,280 (0.9) |
| Smoking in pregnancy, n (%) | 48,405 (6.8) |
| Gestational age in weeks, Mean (SD) | 39.31 (1.18) |
| Parity>1, n (%) | 387,393 (54.4) |
| Newborn sex, female, n (%) | 349,086 (49.0) |
| Birthweight in g, Mean (SD)) | 3428.90 (464.14) |
| Birthweight for gestational age, n (%) | |
| AGA | 590,715 (82.9) |
| LGA | 81,300 (11.4) |
| SGA | 40,423 (5.7) |
| Term low birthweight (<2500 g), n (%) | 15,510 (2.1) |
| Median household income, Mean (SD) | 51,700 (21,099) |
SD=standard deviation; AGA= appropriate for gestational age; LGA=large for gestational age; SGA= small for gestational age.
Newborn size for gestational age was calculated using the Fenton sex-specific reference growth curves.