Table 4.2

Serum cotinine levels among nonsmokers aged 3 years and older, NHANES* 1999–2002

Age groupMedian cotinine level (SE) (95% CI)% with levels ≥0.05 ng/mL§ (SE) (95% CI)% with at least 1 smoker in the home (SE) (95% CI)Total population (2000)Estimated number of persons (in millions) with serum cotinine levels ≥0.05 ng/mL
≥3 years <LODΔ (<LOD–0.52) 47.0 (1.9) (43.0–50.9) 11.1 (0.45) (10.2–12.0) 270,005,230 126.9
3–19 years 0.08 (0.01) (0.06–0.11) 57.7 (2.8) (52.0–63.3) 22.6 (1.4) (19.9–25.6) 69,056,589 39.8
 3–11 years0.09 (0.02) (0.06–0.12)59.6 (2.9) (53.5–65.4)24.9 (1.8) (21.5–28.7)36,697,77621.9
 12–19 years0.07 (0.01) (0.05–0.10)55.6 (3.1) (49.1–61.9)19.9 (1.3) (17.4–22.7)32,358,81318.0
20 years<LOD (<LOD–<LOD) 42.8 (1.9) (39.0–46.6) 6.56 (0.32) (5.93–7.25) 200,948,641 86.0
 20–39 years<LOD (<LOD–0.066)49.2 (2.9) (43.3–55.2)6.85 (0.77) (5.43–8.61)81,562,38940.1
 40–59 years<LOD(<LOD–<LOD)41.6 (2.2) (37.1–46.2)7.3 (0.86) (5.73–9.26)73,589,05230.6
 ≥60 years<LOD(<LOD–<LOD)35.7 (1.7) (32.3–39.4)5.12 (0.52) (4.15–6.3)45,797,20016.3
*

NHANES = National Health and Nutrition Examination Survey.

SE = Standard error.

CI = Confidence interval.

§

ng/mL = Nanograms per milliliter.

Δ

LOD = Limit of detection (0.05 ng/mL).

Sources: U.S. Bureau of the Census 2005; Centers for Disease Control and Prevention, National Center for Health Statistics, unpublished data.

From: 4, Prevalence of Exposure to Secondhand Smoke

Cover of The Health Consequences of Involuntary Exposure to Tobacco Smoke
The Health Consequences of Involuntary Exposure to Tobacco Smoke: A Report of the Surgeon General.
Office on Smoking and Health (US).

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