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Table 2 Comparison of preeclampsia cases, non-cases and controls: demographic, medical and obstetric characteristics ascertained at 24-26 week study visit

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

Characteristic Cases
(n = 113)
Non-cases*
(n = 5107)
Controls
(n = 443)
Age category    
   < 20 years 3% 3% 3%
   20-34 years 78% 79% 79%
   > 34 years 19% 18% 18%
Hospital recruited    
   Hôpital St. Luc 15% 22% 24%
   Hôpital Maisonneuve Rosemont 39% 36% 37%
   Royal Victoria Hospital 22% 18% 17%
   Jewish General Hospital 24% 24% 22%
Body Mass Index before pregnancy, kg/m2    
   < 18.5 2% 8% 9%
   18.5 to < 25 52% 63% 60%
   25 to < 30 27% 18% 18%
   ≥ 30 19% 11% 13%
Primigravida 40% 35% 34%
Use of prenatal vitamins 92% 92% 92%
Diabetes before pregnancy or prior to 24 weeks gestation 6% 2% 1%
High blood pressure before pregnancy 8% 4% 3%
Previous preeclampsia or eclampsia (among women with prior pregnancy lasting > 20 wks) 21% 3% 3%
Smoke currently 10% 16% 16%
  1. * Non-cases = study cohort (n = 5337) excluding cases (n = 113) and women who developed gestational hypertension without preeclampsia (n = 117).
  2. Controls were selected from among non-cases as described under Methods.