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Table 2 Comparing the sociodemographic and clinical variables between women with cases (preeclampsia) and controls

From: Association between breastfeeding and preeclampsia in parous women: a case –control study

Variables Cases (preeclampsia, (n = 116) Controls (n = 232) Odds Ratio (95%CI Confidence Interval) P-value
Variables occurred before the previous breastfeeding
Age, years 33.0 (28.0–38.0) 30.0 (25.0–33.0) 1.08 (1.05,1.13) < 0.001
Parity 4.0 (3.0–6.0) 3.0 (2–5.0) 1.15 (1.05,1.28) 0.004
Education level Numbers (proportion) Numbers (proportion)   
  ≥ secondary 70 (60.3) 129 (55.6) Reference 0.400
  < secondary 46 (39.7) 103 (44.4) 0.82 (0.52,1.29)
Occupation
  Housewife 86 (74.1) 208 (89.7) Reference < 0.001
  Employee 30 (25.9) 24 (10.3) 3.02 (1.67,5.46)
History of preeclampsia
  No 101 (87.1) 193 (83.2) Reference 0.347
  Yes 15 (12.9) 39 (16.8) 0.73 (0.38,1.39)
History of miscarriage
  No 86 (74.1) 169 (72.8) Reference 0.898
  Yes 30 (25.9) 63 (27.2) 0.93 (0.56,1.55)
Body mass index groups
  Underweight 2 (1.7) 0 (0) Undefined  
  Normal weight 50 (43.1) 82 (35.3) Reference  
  Overweight 40 (34.5) 99 (42.7) 0.77 (0.74,1.40) 0.397
  Obese 24 (20.7) 51 (22.0) 0.85 (0.46,1.57) 0.623
Variables occurred after the previous breastfeeding
Interpregnancy interval, months* 22.0 (13.0–36.0) 22.0 (15.0–33.0) 1.01 (0.99,1.02) 0.359
Antenatal care
  ≥ two visits 106 (91.4) 218 (94.0) Reference 0.376
  < two visits 10 (8.6) 14 (6.0) 1.46 (0.63,3.41)
Hemoglobin level, g/dl 10.6.0 (9.8–11.8) 10.5 (9.9–11.4) 0.96 (0.74,1.24) 0.349
Blood groups
  O 53 (45.7) 127 (54.7) Reference 0.113
  Not group O 63 (54.3) 105 (45.3) 1.43 (0.91,2.24)
Infant sex
  Female 58 (50.0) 109 (47.0) Reference 0.649
  Male 58 (50.0) 123 (53.0) 0.88 (0.56,1.38)