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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