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Table 1 Baseline characteristics of preterm infants (n = 834)

From: First-year growth of 834 preterm infants in a Chinese population: a single-center study

Characteristics

VLBW

LBW

NBW

Number of participants

132

504

198

Gestational age (week)

30.6 ± 2

34.5 ± 1.6

36.0 ± 0.8

Birth weight (kg)

1.27 ± 0.16

2.06 ± 0.28

2.79 ± 0.23

WAZ for birth

−0.55 ± 1.02

−0.58 ± 0.75

0.27 ± 0.61

Male

61(46)

264(47)

129(65)

Twins

37(28)

194(38)

44(23)

SGA

27(20.9)

76(15.1)

0(0)

Characteristics of mothers

 Education(college)

56(43.1)

249(49.5)

87(44.1)

 Primipara

53(40.6)

234(46.5)

109(55.3)

 Maternal age at birth (years)

27.0 ± 3.3

27.3 ± 4.1

26.9 ± 3.0

  1. Values are mean ± SD or n (%). WAZ: weight-for-age Z-score; SGA: Small-for-gestational age