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Table 3 Gestational age and fetal growth among preeclampsia cases and controls

From: Smoking in preeclamptic women is associated with higher birthweight for gestational age and lower soluble fms-like tyrosine kinase-1 levels: a nested case control study

  Cases Controls P value
Gestational age at delivery, weeks; mean (SD)* 36.8 (3.5) 39.2 (1.4) < 0.0001
Gestational age at delivery, weeks*    
   < 32 weeks 8 (7%) 1 (0%) < 0.0001
   32-33 weeks 6 (5%) 0 (0%)  
   34-36 weeks 23 (21%) 18 (4%)  
   ≥ 37 weeks 76 (67%) 415 (96%)  
Birthweight, grams; mean (SD)# 2834.4 (848.4) 3485.3 (500.2) < 0.0001
Z-score birthweight for gestational age^; mean (SD) -0.31 (1.0) 0.15 (0.9) < 0.0001
Small for gestational age^ 22 (21.6%) 32 (7.3%) < 0.0001
Large for gestational age^ 6 (5.9%) 50 (11.3%) 0.10
Z-score placental weight for gestational age+;
mean (SD)
-0.01(1.13) 0.15 (0.98) 0.25
  1. Values shown are n (%) unless otherwise noted
  2. * data missing for 9 subjects;# data missing for 5 subjects;
  3. ^ Z-score birthweight for gestational age, small for gestational age, large for gestational age as defined in Kramer et al [14]; data missing for 13 subjects
  4. + Z-score placental weight for gestational age calculated as defined by McNamara [15, 16]; placenta data missing for 186 subjects