Table 2

Characteristics of the two cohorts

Infants <1500 g
Characteristics1986 cohort1998–1999 cohortp Value
Values are number (%).
*Excludes data for two NICUs for which data were unavailable.
NICU, Neonatal intensive care unit.
Born in a hospital with a level III NICU297 (72)943 (87)<0.001
Born in a hospital with a level II NICU96 (23)109 (10)<0.001
Male213 (52)542 (50)0.60
Infants from a multiple birth94 (23)318 (29)0.011
5 minute Apgar score less than 777 (19)149 (14)0.025
Major congenital malformation25 (6)47 (4)0.17
Antenatal corticosteroids214 (58)678 (80)*<0.001