Table 4.

Serum Cotinine Levels by Smoking and HIV Status

Current Smoking Category	HIV-Infected Participants		HIV-Uninfected Participants		P
	N	Cotinine, median (IQR)	N	Cotinine, median (IQR)
Light/moderate smokers	100	372.4 (214.1 – 582.8)	50	487.9 (292.7 – 704.8)	0.104
Heavy smokers	21	494.0 (369.6 – 619.9)	49	741.4 (379.4 – 1000)	0.050
Current smokers, by more detailed categories of cigarette consumption
1-9 cigarettes per day	55	368.6 (193.0 – 599.5)	24	412.9 (267.8 – 561.5)	0.639
10-19 cigarettes per day	45	394.1 (280.3 – 567.1)	26	581.8 (390.9 – 797.0)	0.072
20-29 cigarettes per day	14	441.4 (332.6 – 570.9)	40	771.6 (361.4 – 1000)	0.057
30+ cigarettes per day	7	586.4 (464.7 – 634.4)	9	564.7 (396.3 – 1000)	0.791
Nonsmokers	11	25.0 (9.9 – 38.1)	39	19.7 (7.4 – 42.2)	0.505
With cotinine > 10 ng/ml	8	29.4 (20.5 – 434.25)	26	30.1 (19.7- 289.6)	0.655

Abbreviations: HIV human immunodeficiency virus, IQR interquartile range

Light/moderate smokers: less than 20 cigarettes per day; heavy smokers: 20 or more cigarettes per day; nonsmokers: no cigarettes within

Entries in table correspond to median cotinine (IQR), unless otherwise indicated.