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Data from the 1999–2012 National Health and Nutrition Examination Survey (NHANES) were analyzed to assess the most recent trends and correlates of SHS exposure among nonsmokers aged ≥3 years. Since 1999, NHANES has been conducted in continuous 2-year cycles.

NHANES is a complex, multistage survey representative of the noninstitutionalized U. NHANES includes a home interview, physical examination at a mobile examination center where biologic specimens are collected, and laboratory specimen testing, including serum cotinine analysis, for participants aged ≥3 SHS exposure was assessed using serum cotinine, a metabolite of nicotine that reflects recent exposure (4,6).

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SHS exposure among nonsmokers was defined as a serum cotinine level (a metabolite of nicotine) of 0.05–10 ng/m L.

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