Table 1.

Mean cotinine in DBS from infants of smoking and nonsmoking mothers

Maternal smoking statusnMean DBS cotinine, ng/mL (SD)P*
Nonsmoker108.8 (7.4)
Smoker1028.7 (7.5)0.002
Confirmed at 7 mo444.7 (9.7)<0.001
Not confirmed at 7 mo618.0 (7.8)0.034
  • * P value from t test for two samples comparing DBS from infants of smokers with DBS from infants of nonsmokers.