. Author manuscript; available in PMC: 2014 Apr 23.

Published in final edited form as: Arch Pediatr Adolesc Med. 2012 Sep 1;166(9):851–856. doi: 10.1001/archpediatrics.2012.170

Table 3.

Mean Difference in 3HC, Cotinine, and NMR for Subjects With Detectable 3HC and Cotinine^a

Race/Ethnicity	No. of Subjects	3HC Level (95% CI), ng/mL	Cotinine Level (95% CI), ng/mL	3HC/Cotinine NMR (95% CI)
Latino	25	0.13	0.28	0.69
African American	47	2.71 (1.17–6.27)	4.94 (2.30–10.61)	−0.39 (−0.05 to −0.73)
Asian	7	0.53 (0.12–2.25)	0.64 (0.17–2.40)	−0.20 (−0.78 to 0.38)
White	7	1.38 (0.32–5.89)	1.79 (0.48–6.68)	−0.29 (−0.87 to 0.29)
Other	2	1.64 (0.14–19.78)	1.69 (0.17–16.32)	−0.22 (−1.22 to 0.78)

Abbreviations: NMR, nicotine metabolite ratio; 3HC, 3′-hydroxycotinine.

Mean difference calculated using Latinos as the reference group, adjusted for age and sex.