Table 1. Participant and pregnancy characteristics in the NICHD Fetal Growth Studies–Singletons (N = 2,288).
| Characteristic | n (%) or mean ± SD |
|---|---|
| Maternal age (y) | 28.2 (5.4) |
| Maternal height (cm) | 162.8 (7.0) |
| Maternal weight (kg) | 67.4 (14.9) |
| BMI (kg/m2) | |
| < 18.5 | 12 (0.5%) |
| 18.5 to < 25 | 1290 (56.4%) |
| 25 to < 30 | 595 (26.0%) |
| 30 to <35 | 251 (11.0%) |
| ≥ 35 | 140 (6.1%) |
| Parity | |
| 0 | 1062 (46.4%) |
| 1 | 791 (34.6%) |
| 2+ | 435 (19.0%) |
| Race/ethnic group | |
| Non-Hispanic white | 643 (28.1%) |
| Non-Hispanic black | 607 (26.5%) |
| Hispanic | 665 (29.1%) |
| Asian/Pacific Islander | 373 (16.3%) |
| Smoking | 10 (0.4%) |
| Gestational Diabetes | 96 (4.2%) |
| Maternal hypertensive disease | |
| No Hypertension | 2147 (93.8%) |
| Mild Gestational Hypertension | 59 (2.6%) |
| Severe Gestational Hypertension | 4 (0.2%) |
| Mild Preeclampsia | 48 (2.1%) |
| Severe Preeclampsia | 13 (0.6%) |
| Unspecified Hypertension | 17 (0.7%) |
| Other Diseases | |
| Asthma | 5 (0.2%) |
| Thyroid disease | 4 (0.2%) |
| Hematologic disorders | 5 (0.2%) |
| Antepartum bleeding | 620 (27.1%) |
| Abruption | 9 (0.4%) |
| Gestational age at delivery (wk) | 39.5 (1.1) |
| Infant birthweight (g) | 3390.6 (438.5) |
| Infant sex | |
| Male | 1162 (50.8%) |
| Female | 1126 (49.2%) |
| Neonatal death | 1 (0.0%) |
| Paternal height (cm)a | 177.66 (8.50) |
| Paternal weight (kg) a | 84.8 (16.2) |
a n = 2040
Data are from the NICHD Fetal Growth Studies–Singleton.