Table 2.

Comparing cases and controls on serum levels of cotinine, NNAL, PheT, and years of smoking

VariablesControls, n= 100
Cases, n= 100
Difference (controls-cases)
P
Mean ± SDMean ± SDMean ± SE
Years of cigarette smoking41.6 ± 7.245.4 ± 6.5−3.9 ± 1.00.0001
Cotinine (ng/mL)217 ± 111227 ± 93−10 ± 150.4681
Total NNAL (fmol/mL)77.4 ± 39.392.4 ± 40.7−15.0 ± 5.70.0084
PheT (fmol/mL)76.3 ± 66.892.5 ± 107.6−16.1 ± 12.70.2039