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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