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Table 1 Distribution of birthweights in the study cohorts. Distribution of birthweights did not differ between Cohorts.

From: Increasing illness severity in very low birth weight infants over a 9-year period

  Birthweight <500 grams Birthweight 500–749 grams Birthweight 750–999 grams Birthweight 1000–1249 grams Birthweight 1250–1500 grams
Cohort 1 1993–1996 2% 19% 22% 26% 31%
Cohort 2 1996–1999 2% 15% 24% 30% 29%
Cohort 3 1999–2002 2% 18% 25% 27% 28%