Table 2.
Characteristics of study sample.
| Full sample (N=2036) |
||
|---|---|---|
| Variable | N | M (SD) or % |
| Neonatal characteristics | ||
| Gestational age at birth (weeks) | 2026 | 26.1 (1.75) |
| Birth weight (grams) | 2021 | 886.4 (279.5) |
| Small for gestational age | 1282 | 15% |
| Male sex | 2036 | 52% |
| Female sex | 2036 | 48% |
| Infant admitted to NICU | 2036 | 100% |
| Infant race | 2036 | |
| American Indian/Alaskan Native | <1% | |
| Asian | 3% | |
| Black | 24% | |
| Multiple Races | 6.5% | |
| Native Hawaiian/Pacific Islander | <1% | |
| Other Race | 5.9% | |
| Race Unknown | 1.5% | |
| White | 58% | |
| Infant ethnicity | 2036 | |
| Hispanic/Latino/a | 15% | |
| Not Hispanic/Latino/a | 85% | |
| Full sample (N=1761) |
||
| N | M (SD) or % | |
| Maternal demographics | ||
| Age at birth (years) | 1663 | 29.1 (6.6) |
| 4-year college degree | 1467 | 29% |
| Married/partnered | 1491 | 76% |
| Maternal medical problems | ||
| Gestational diabetes | 1433 | 8.0% |
| Pre-eclampsia | 1756 | 20% |
| Perinatal maternal substance use | ||
| Tobacco | 1687 | 13% |
| Alcohol | 763 | 3.5% |
| Opioid | 784 | 18% |
| Marijuana | 755 | 7.3% |
| Illicit drugs | 753 | 4.1% |
NICU, neonatal intensive care unit.