Table 1.

Cigarette Use and Urinary Biomarker Levels

	Mean (SD)	Median	Range	N
Cigarettes per day on days smoked	3.26 (2.15)	3.0	1–11	56
Total cigarettes/8 days	17.07 (13.83)	13.0	1–52	57
Days smoked/30 days	12.96 (5.41)	15.0	1–24	57
Urinary creatinine, mg/ml	1.19 (0.71)	1.0	0.14–3.15	57
Normalized urinary nicotine, ng/mg creatine	914.93 (2137.08)	240.46	2.7–15062	56
Normalized urinary NNAL, pg/mg creatine	268.13 (422.83)	140.74	0.77–2305.68	57
Normalized urinary cotinine, ng/mg creatine	804.40 (917.76)	490.85	3.21–3743	56

Note. NNAL = 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol. Urinary nicotine, NNAL, and cotinine were creatinine normalized. Ns ranged from 56 to 57 due to missing values.