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Table 4 Self-reported cigarette smoking and hair nicotine levels in 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

Variable Cases
N = 113
Controls
N = 443
p-value
Smoked throughout pregnancy 10 (8.9%) 69 (15.6%) 0.07
Smoked steadily (within the same category of number of cigarettes) throughout pregnancy 4 (3.4%) 41 (9.3%) 0.05
Average number of cigarettes/day, mean (SD)* 1.20 (3.6) 1.91 (4.7) 0.08
Category of average number of cigarettes smoked per day    
0 90 (80.4%) 340 (77.3%) 0.69
1-10 16 (14.3%) 67 (15.2%)  
> 10 6 (5.4%) 33 (7.5%)  
Hair nicotine (ng/mg), mean (SD)# 1.29 (2.9) 1.94 (5.4) 0.10
  1. Values shown are n (%) unless otherwise noted
  2. * calculated as average of the number of cigarettes smoked per day in each of the trimesters.
  3. # Hair nicotine available for 99 cases and 398 controls