Table 3.

Median Urine Cotinine Values by smoking status and gender, ethnicity and age.

	Active Smokers (Urine Cotinine >30 ng/ml)			Non-Smokers
	n	Median (IQR)	p	n	Median (IQR)	p
A - All	55	155.2 (68.8–579.2)		410	0.3 (0.1–1.3)
Gender
Male	20	146.3 (73.6–390.2)		163	0.3 (0.1–1.1)
Female	35	155.2 (57.0–791.0)	0.9	247	0.3 (0.1–1.5)	0.6
Ethnicity
Asian	0	-		51	0.3 (0.1–1.7)
Latino	8	50.3 (36.6–101.7)		235	0.2 (0.1–0.6)
Black	32	139.3 (73.6–657.5)		70	1.3 (0.3–4.8)
White	5	282.9 (250.4–406.1)		10	0.8 (0.2–2.0)
Mixed/Other	10	311.6 (161.7–811.8)	< 0.01	44	0.4 (0.2–1.8)	< 0.01
Age
13-14	5	283.3 (78.4–800.2)		95	0.2 (0.1–1.1)
15-16	21	104.9 (56.2–250.4)		181	0.3 (0.1–1.1)
17-19	29	238.8 (111.5–791.0)	0.12	134	0.3 (0.1–2.7)	0.02
B - All	54	104.6 (40.0–263.0)		384	0.2 (0.1–0.9)
Gender
Male	20	98.9 (41.8–186.8)		152	0.2 (0.1–0.7)
Female	34	115.8 (31.6–298.6)	0.8	232	0.3 (0.1–1.0)	0.3
Ethnicity
Asian	0	-		47	0.3 (0.1–1.1)
Latino	7	26.2 (12.7–99.1)		217	0.1 (0.1–0.5)
Black	32	84.8 (41.6–310.62)		69	0.7 (0.2–3.2)
White	5	261.9 (111.4–285.1)		8	1.1 (0.1–2.4)
Mixed/Other	10	157.3 (110.1–249.6)	0.03	43	0.3 (0.1–0.9)	< 0.01
Age
13-14	5	138.2 (40.0–322.6)		87	0.2 (0.1–0.8)
15-16	20	66.9 (35.7–201.3)		171	0.2 (0.1–0.9)
17-19	29	116.0 (56.6–298.6)	0.4	126	0.2 (0.1–1.7)	0.06

A – Volume Based Cotinine (ng/ml); B – Creatinine-Adjusted Cotinine (ng/mg creatinine)