Basic information and statistical comparisons for infants of less than 25 weeks estimated gestational age in the Neonatal Research Network in group I (birth from 1 January 1991 to 31 December 1994) and group II (birth 1 January 1995 to 31 December 1998)
| Group I (n = 1408) | Group II (n = 1348) | p Value | |
|---|---|---|---|
| *Values are mean (SD). | |||
| †EGA, estimated gestational age in weeks, with results presented as total number of patients within the group in the particular EGA category followed by % of group in parentheses. | |||
| NS, Not significant by χ2 test; significance was assigned at p<0.05. | |||
| Birth weight (g)* | 645 (108) | 645 (101) | NS |
| Male (%) | 54.4 | 54.3 | NS |
| Race | <0.0001 | ||
| White (%) | 27.5 | 32.6 | |
| Black (%) | 60 | 49.3 | |
| Hispanic (%) | 10.7 | 15.6 | |
| Inborn (%) | 88.9 | 89.1 | NS |
| EGA† | 0.0064 | ||
| <22 | 45 (3.2) | 24 (1.8) | |
| 22 | 174 (12.3) | 130 (9.6) | |
| 23 | 473 (33.6) | 453 (33.6) | |
| 24 | 716 (50.9) | 741 (55.0) | |