Table 2

Proportions of extremely low birthweight (500–999 g) compared with very low birthweight (500–1499 g) infants in the study cohort and national populations in each country in 1993 and 1994

Infants 500–999 g birthweight Infants 500–1499 g birthweight % infants 500–999 g birthweight χ2 p Value
 Study cohort (8 intensive care units)33886739
 All live births4581216380.370.54
 Study cohort (6 intensive care units)515144936
 All live births18204770380.10.75