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Table 2 Maternal characteristics and pregnancy outcome in relation to maternal obesity class. Categorical variables N (%)

From: Maternal obesity (Class I-III), gestational weight gain and maternal leptin levels during and after pregnancy: a prospective cohort study

  Obesity class I Obesity class II Obesity class III P-value
Parity     0.714
 Nulliparous 96 (43.0) 36 (46.8) 21 (48.8)  
 Multiparous 127 (57.0) 41 (53.2) 22 (51.2)  
Smoking in pregnancy     0.059
 No 206 (93.2) 72 (94.7) 35 (83.3)  
 Yes 15 (6.8) 4 (5.3) 7 (16.7)  
Alcohol in first trimester     #
 No/rarely 223 (100.0) 77 (100.0) 43 (100.0)  
 Yes 0 (0.0) 0 (0.0) 0 (0.0)  
Pre-term (<37 weeks)     0.046
 No 209 (94.6) 76 (100.0) 38 (90.5)  
 Yes 12 (5.4) 0 (0.0) 4 (9.5)  
Post-term (≥42 weeks)     0.993
 No 206 (93.2) 71 (93.4) 39 (92.9)  
 Yes 15 (6.8) 5 (6.6) 3 (7.1)  
GDM     0.505
 No 211 (94.6) 75 (97.4) 40 (93.0)  
 Yes 12 (5.4) 2 (2.6) 3 (7.0)  
Pre-eclampsia     0.009
 No 211 (94.6) 68 (88.3) 35 (81.4)  
 Yes 12 (5.4) 9 (11.7) 8 (18.6)  
Hypertension pre-pregnancy     #
 No 221 (99.1) 77 (100.0) 42 (97.7)  
 Yes 2 (0.9) 0 (0.0) 1 (2.3)  
  1. GDM = Gestational diabetes mellitus
  2. P < 0.05 statistical significance in difference between obesity class I-III groups
  3. # = Assumption for chi2-test not fulfilled