Table 1.
Selected characteristics of 125 mother-infant dyads in the National Children’s Study.
| Characteristics | Overall N (%) |
|---|---|
| Race/ethnicity [N (%)] | |
| White | 101 (80.8) |
| African American or Black | 7 (5.6) |
| Other | 17 (13.6) |
| Maternal age [N (%)] | |
| <20 years | 11 (8.8) |
| 20–25 years | 32 (25.6) |
| 26–30 years | 35 (28.0) |
| 30–35 years | 36 (28.8) |
| 36+ years | 11 (8.8) |
| Education level [N (%)] | |
| < High school | 8 (6.4) |
| High school graduate | 53 (42.4) |
| > High school | 64 (51.2) |
| Family income [N (%)] | |
| ≤ $29,999 | 29 (23.2) |
| $30,000 – $74,999 | 50 (40.0) |
| ≥ $75,000 | 46 (36.8) |
| Number of previous livebirths [N (%)] | |
| 0 | 43 (34.4) |
| 1 | 48 (38.4) |
| ≥ 2 | 34 (27.2) |
| Smoking status during pregnancy [n (%)] | |
| Yes | 9 (7.2) |
| No | 116 (92.8) |
| Pre-pregnancy BMIa [N (%)] | |
| Normal/Underweight | 74 (59.2) |
| Overweight | 51 (40.8) |
| Infant sex [N (%)] | |
| Male | 68 (54.4) |
| Female | 57 (45.6) |
| Infant birth outcomes (mean ± SD) | |
| Gestational age, weeks | 38.58 ± 1.81 |
| Birthweight, kg | 3340 ± 574 |
| Birth length, cm | 49.87 ± 2.88 |
| Head circumference, cm | 34.61 ± 1.81 |
| Ponderal index, kg/m3 | 26.89 ± 3.92 |
a
IQR: interquartile range.