Table 3.
Smoking Status by Serum Cotinine and Urine NNAL | ||||
---|---|---|---|---|
Smoking Status by History |
Nonsmoker (Cotinine = 0 ng/mL AND NNAL = 0 pg/mg Cr) |
Exposed to Secondhand Smoke (Cotinine >0, <3.1 ng/mL OR NNAL >0, <64 pg/mg Cr) |
Smoker (Cotinine ≥3.1 ng/mL OR NNAL ≥64 pg/mg Cr) |
Total |
Nonsmoker | 1 | 21 | 6 | 28 |
Smoker | 1 | 0 | 28 | 29 |
Unknown | 2 | 1 | 0 | 3 |
Total | 4 | 22 | 34 | 60 |
Cr, creatinine; NNAL, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol.