Table 5 Illness severity by 250 gram birthweight increments. Data for infants <500 grams are not provided due to small numbers.
From: Increasing illness severity in very low birth weight infants over a 9-year period
Birthweight 500–749 grams | Birthweight 750–999 grams | Birthweight 1000–1249 grams | Birthweight 1250–1500 grams | Birthweight p | |
|---|---|---|---|---|---|
T4 (μg/dl) | |||||
Cohort 1 1993–1996 | 4.5 ± 2.3 | 6.1 ± 3.1 | 8.0 ± 3.5 | 9.8 ± 3.6 | <.01 |
Cohort 2 1996–1999 | 4.3 ± 3.3 | 5.8 ± 2.9 | 7.4 ± 2.9 | 8.9 ± 3.2 | <.01 |
Cohort 3 1999–2002 | 3.6 ± 2.3 | 5.0 ± 2.9 | 6.9 ± 3.7 | 8.3 ± 3.7 | <.01 |
Cohort, p | .20 | .03 | .04 | .03 | |
SNAP | |||||
Cohort 2 1996–1999 | 17.1 ± 6.7 | 13.6 ± 7.0 | 10.1 ± 5.0 | 8.0 ± 4.6 | <.01 |
Cohort 3 1999–2002 | 22.0 ± 9.3 | 15.8 ± 7.6 | 11.4 ± 5.4 | 9.3 ± 5.7 | <.01 |
Cohort, p | .01 | .03 | .04 | .05 |