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Table 1 Mean birth weight-for-gestational-age z-scores and percent of mean live birth weight at very, moderate, late preterm, and term gestation, Swedish live births and stillbirths, 1992-2001

From: Birth weight differences between preterm stillbirths and live births: analysis of population-based studies from the U.S. and Sweden

 

Mean birth weight-for-gestational-age z-score

P-value

 

Live births (n=943,274)

Stillbirths (n=3,096)

 

Preterm (n=46,531)

−0.29

−1.41

<0.001

  

Intrapartum

Antepartum

 
  

−1.38

−1.41

0.249

 28-31 weeks (n=4,783)

−0.96

−1.68

−1.87

 

 32-33 weeks (n=5,963)

−0.60

−1.14

−1.41

 

 34-36 weeks (n=35,785)

−0.16

−1.33

−1.01

 

Term (n=899,812)

+0.03

−0.55

<0.001

  

Intrapartum

Antepartum

 
  

−0.05

−0.59

<0.001

 

Percent of mean live birth weight

 

Preterm

100 (ref)

89.2

<0.001

  

Intrapartum

Antepartum

 
  

89.0

88.9

0.283

 28-31 weeks

100 (ref)

90.8

87.9

 

 32-33 weeks

100 (ref)

92.3

89.3

 

 34-36 weeks

100 (ref)

86.2

89.6

 

Term

100 (ref)

92.7

<0.001

  

Intrapartum

Antepartum

 
  

98.9

92.2

<0.001