Table 4

Mortality by birth weight; extremely low birth weight (ELBW, <1000 g), very low birth weight (VLBW, 1000–<1500 g), low birth weight (LBW, 1500–<2500 g), normal (2500–<4000 g) and large for gestational age (LGA, ≥4000 g)

MortalityTime to death Time to death in days*
Birth weightPooled estimatesHospital-specific estimates
n (%)95% CIMedian (%)Range (%)Median (range)
ELBW (n=16)14 (88)58 to 971000–1001 (<1–54)
VLBW (n=100)51 (51)32 to 70330–1001 (<1–15)
LBW (n=340)49 (14)9 to 22130–471 (<1–93)
Normal (n=559)62 (11)6.5 to 187.70–501 (<1–14)
LGA (n=50)4 (8)3.6 to 1700–331.5 (<1–20)
Total (n=1065)†180 (17)11 to 2416.40–461 (<1–93)
  • *Time to death from admission.

  • In 15% of cases (184/1249), it was not possible to determine the outcome by birth weight (either due to missing outcome or birth weight data).

  • Four hospitals recorded no mortality, possibly representing a ‘retrieval’ bias in obtaining mortality files.