Table 3.
Neonatal anthropometry by self-identified maternal race/ethnicity, NICHD Fetal Growth Studies – singletons, 2009–2013.
| Anthropometric measurement | Cohort Md (IQR) |
Non-Hispanic White Md (IQR) |
Non-Hispanic Black Md (IQR) |
Hispanic Md (IQR) |
Asian Md (IQR) |
p-Value |
|---|---|---|---|---|---|---|
| Gestational age | 39.4 (38.7, 40.3) | 39.4 (38.9, 40.3) | 39.4 (38.4, 40.3) | 39.4 (38.7, 40.3) | 39.3 (38.6, 40.1) | 0.07 |
| Birth weight (g) | ||||||
| Weight | 3280 (3005, 3590) | 3402 (3090, 3685) | 3185 (2912, 3459) | 3300 (3008, 3600) | 3210 (3005, 3546) | < 0.001 |
| Lengths (cm) | ||||||
| Birth length | 50.0 (48.5, 51.8) | 50.8 (49.0, 52.2) | 49.8 (48.0, 51.0) | 50.0 (48.5, 51.5) | 50.0 (48.6, 51.7) | < 0.001 |
| Upper arm | 10.0 (9.5, 11.0) | 10.2 (10.0, 11.0) | 10.0 (9.0, 11.0) | 10.0 (9.5, 10.9) | 10.0 (9.5, 10.5) | < 0.001 |
| Upper thigh | 10.2 (9.8, 11.0) | 10.0 (9.5, 11.1) | 10.0 (10.0, 11.0) | 10.2 (9.5, 11.0) | 10.4 (9.7, 11.0) | 0.77 |
| Circumferences (cm) | ||||||
| Head | 34.0 (33.0, 35.0) | 34.4 (33.5, 35.3) | 33.5 (32.5, 34.5) | 34.0 (33.0, 35.0) | 34.0 (33.1, 35.0) | < 0.001 |
| Umbilical | 31.1 (29.5, 33.0) | 31.5 (29.6, 33.0) | 30.2 (29.0, 32.0) | 31.8 (30.0, 33.0) | 31.5 (29.9, 33.1) | < 0.001 |
NOTE: Restricted to live births born to 564 White, 549 Black, 590 Hispanic, and 403 Asian mothers participating in the study. All data were rounded to nearest decimal place. Missing data for anthropometric measurements were: < 1% (gestational age, birth weight), 6% (weight, head circumference) and 7% (birth length, upper arm and thigh lengths). p-Values were obtained from the Kruskal-Wallis nonparametric test comparing median concentrations by race/ethnicity. Md, median; IQR interquartile range.