Table 1.
Characteristics and Outcomes of the Study Infants
| Characteristic | Full Study Cohort (N = 2,677) |
|---|---|
| Gestational age, wk, mean (SD) | 25.2 (1.3) |
| <27 wk, n (%) | 2,380 (89) |
| 27 wk to 31 wk and 6 d, n (%) | 297 (11) |
| Birth weight, g, mean (SD) | 765 (168) |
| Sex, male, n (%) | 1,356 (51) |
| Small for gestational age, n (%)* | 219 (8) |
| Race, n (%) | |
| Black | 1,225 (46) |
| White | 1,312 (49) |
| Other | 140 (5) |
| Ethnicity, n (%) | |
| Hispanic | 322 (12) |
| Non-Hispanic | 2,355 (88) |
| Corrected age at follow-up, mo, mean (SD) | 23.3 (3.0) |
| Follow-up at 18–22 mo corrected age, n (%)† | 719 (28) |
| Follow-up at 22–26 mo corrected age, n (%)† | 1,849 (72) |
| Antenatal corticosteroids, n (%) | 2,397 (90) |
| Antenatal magnesium, n (%) | 2,077 (78) |
| Maternal marital status, married, n (%) | 1,126 (42) |
| Insurance type, n (%) | |
| Medicaid | 1,528 (57) |
| Private | 1,012 (38) |
| Self-pay/uninsured | 101 (4) |
| Other | 36 (1) |
| Maternal level of education less than high school, n (%) | 499 (19) |
| Outcome | |
| Late death or serious respiratory morbidity, n (%) | 683 (26) |
| Late death or moderate to severe NDI, n (%) | 1,305 (49) |
Definition of abbreviation: NDI = neurodevelopmental impairment.
*
Defined as a birth weight below the 10th percentile for gestational age and sex (25).
†
Calculated for the 2,568 infants who survived to follow-up testing.