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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