Table 1.
Description of cohort by self-identified maternal racial/ethnic identity, NICHD Fetal Growth Studies- singletons, 2009–2013.
| Characteristic | Cohort n = 2106 | Non-Hispanic White n = 564 | Non-Hispanic Black n = 549 | Hispanic n = 590 | Asian/Pacific Islander n = 403 | |
|---|---|---|---|---|---|---|
| Mean (± standard deviation) | ||||||
| Age (years) | 28 ± 5 | n = 2106 | 30 ± 4 | 25 ± 5 | 27 ± 5 | 31 ± 5 |
| Pre-pregnancy BMI (kg/m2)a | 23.6 ± 3.0 | n = 2101 | 23.2 ± 2.8 | 24.1 ± 3.1 | 24.3 ± 2.8 | 22.2 ± 2.6 |
| Prenatal BMI (kg/m2)b | 24.4 ± 3.5 | n = 2087 | 24.1 ± 3.1 | 24.9 ± 3.7 | 25.2 ± 3.4 | 23.1 ± 3.2 |
| Number (percent) | ||||||
| Parous | ||||||
| Previous live birth | 1073 (51) | n = 2106 | 256 (45) | 272 (50) | 358 (61) | 187 (46) |
| No previous live birth | 1033 (49) | n = 2106 | 308 (55) | 277 (51) | 232 (39) | 216 (54) |
| Education | ||||||
| College or more | 1522 (72) | n = 2106 | 534 (95) | 340 (62) | 311 (53) | 337 (84) |
| Less than college | 584 (28) | n = 2106 | 30 (5) | 209 (38) | 279 (47) | 66 (16) |
| Marital status | ||||||
| Married/living as married | 1595 (76) | n = 2104 | 530 (94) | 266 (49) | 430 (73) | 369 (92) |
| Not married | 509 (24) | n = 2104 | 33 (6) | 282 (52) | 160 (27) | 34 (8) |
| Health insurance | ||||||
| Private/Managed care | 1361 (65) | n = 2106 | 534 (95) | 263 (48) | 226 (38) | 338 (84) |
| Other | 745 (35) | n = 2106 | 30 (5) | 286 (52) | 364 (62) | 65 (16) |
| Sex index birth | ||||||
| Male | 1088 (52) | n = 2096 | 306 (54) | 270 (50) | 306 (52) | 206 (51) |
| Female | 1008 (48) | n = 2096 | 257 (46) | 276 (51) | 280 (48) | 195 (49) |
| Secondary sex ratio | 1.08 | 1.19 | 0.98 | 1.09 | 1.06 | |
NOTE: Missing data were minimal, < 1% for marital status and 1% for prenatal BMI and infant sex.
a
Self-reported height and weight prior to pregnancy, body mass index (BMI, kg/m2).
b
Measured height and weight upon enrollment into cohort, body mass index (BMI, kg/m2).