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Table 1 Comparison of Epochs 1 and Epoch 2: Characteristics of extremely low gestational age newborns.

From: Survival and major neurodevelopmental impairment in extremely low gestational age newborns born 1990–2000: a retrospective cohort study

Attribute

Epoch 1 (n = 310)

Epoch 2 (n = 356)

p value

Birth weight, g*

785 (513, 1145)

760 (475, 1140)

0.1

GA, weeks*

26 (23, 27)

25 (23, 27)

0.2

SGA

9%

9%

0.8

Female

49%

51%

0.6

Non-white

45%

50%

0.2

Multiple gestation

11%

16%

0.1

C-section

42%

47%

0.2

No resuscitation

9%

6%

0.09

  1. *expressed as median (5th, 95th percentiles)
  2. GA, gestational age
  3. SGA, small for gestational age based on data reported by Kramer [13]