. Author manuscript; available in PMC: 2020 Feb 19.

Published in final edited form as: Environ Sci Technol. 2019 Feb 6;53(4):2134–2140. doi: 10.1021/acs.est.8b05579

Table 2.

Nitromethane sample-weighted medians (ng/L) with 25^th and 75^th percentiles for exclusive smokers and non-users, NHANES 2007–2012 (N=6,730)^a

Demographic Category		Median (ng/L) [25^th, 75^th Percentiles], exclusive smokers	Median (ng/L) [25^th, 75^th Percentiles], non-users
	All	774 [633, 955]	625 [502, 797]
NHANES Cycle	2007 – 2008	763 [628, 954]	627 [511, 815]
	2009 – 2010	788 [645, 954]	615 [495, 793]
	2011 – 2012	779 [624, 958]	631 [509, 781]
Age (years)	12–19	668 [559, 829]	556 [459, 709]
	20–39	750 [631, 927]	619 [501, 761]
	40–59	781 [630, 945]	631 [508, 812]
	≥60	885 [696, 1150]	669 [535, 885]
Sex	Male	773 [628, 951]	614 [497, 773]
Sex	Female	774 [645, 956]	635 [510, 814]
Race/Ethnicity	Non-Hispanic White	772 [627, 954]	610 [494, 759]
	Non-Hispanic Black	853 [683, 1040]	673 [535, 870]
	Mexican American	749 [634, 946]	649 [519, 836]
	Other Race	729 [632, 900]	692 [544, 884]
BMI	Underweight	736 [613, 834]	551 [467, 679]
	Healthy weight	745 [608, 918]	588 [473, 754]
	Overweight/Obese	790 [647, 965]	639 [523, 812]
Poverty status	No	773 [632, 948]	628 [508, 793]
Poverty status	Yes	785 [635, 988]	601 [478, 818]

Same data as in stratified cotinine regression models.