Table 3.
Concurrence between cigarette smoke exposure by history and by combined biomarker status (n = 60)
| 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.