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% |