Table 1

Cohort characteristics for the two seasons studied

1998/99 infants1999/2000 infants
Number
of infants
Gestation (wk)Birth weight (kg)Number
of infants
Gestation (wk)Birth weight (kg)
All at risk infants37033 (31–35)1.85 (1.38–2.30)28633 (30–35)1.90 (1.30–2.35)
Group 129034 (32–35)2.02 (1.63–2.37)22934 (32–35)2.05 (1.60–2.42)
Group 28028 (26–31)1.10 (0.87–1.38)5728 (27–30)1.11 (0.93–1.31)
  • 1-150 Values shown are number or median (interquartile range).