Table 2.
Characteristics of infants born at the threshold of viability (<750 g): Colorado, 1991–1996 vs 1997–2003
| 1991–1996 | 1997–2003 | P-value | |
|---|---|---|---|
| N (%) | N (%) | ||
| No. live births | 1029 | 1664 | |
| No. neonatal deaths | 633 (61.5) | 1084 (65.1) | 0.06 |
| Characteristics of birth | |||
| Male infants | 515 (50.1) | 867 (52.1) | 0.36 |
| Gestational age (mean ± s.d.) | 24.2 ± 3.24 | 23.7 ± 3.14 | <0.01 |
| Ventilation status | 0.02 | ||
| >30 min | 266 (22.0) | 437 (26.3) | |
| <30 min | 54 (5.3) | 67 (4.0) | |
| Not ventilated | 749 (72.8) | 1160 (69.7) | |
| Presence of congenital anomalies | 124 (12.1) | 162 (9.7) | 0.06 |
| Characteristics of mother | |||
| Age (mean ± s.d.) | 26.1 ± 6.8 | 26.7 ± 6.6 | 0.02 |
| Race and ethnicity | 0.28 | ||
| Caucasian, non-Hispanic | 639 (62.1) | 1046 (62.9) | |
| Caucasian, Hispanic | 181 (17.6) | 314 (18.9) | |
| African American, non-Hispanic | 168 (16.3) | 229 (13.8) | |
| Other | 41 (4.0) | 75 (4.5) | |
| Education, highest grade complete (mean ± s.d.) | 12.6 ± 2.8 | 12.6 ± 2.8 | 0.64 |
| Alcohol use | <0.01 | ||
| Yes | 43 (4.2) | 51 (3.1) | |
| No | 955 (92.8) | 1613 (96.9) | |
| Unknown | 31 (3.0) | 0 (0) | |
| Tobacco use | <0.01 | ||
| Yes | 186 (18.1) | 214 (12.9) | |
| No | 815 (79.2) | 1450 (87.1) | |
| Unknown | 28 (2.7) | 0 (0) |