Table 2.

Geometric mean serum cotinine levels (ng/mL) among 1,943 smokers aged 20 years or older by race/ethnicity and cigarettes smoked per day, NHANES 2001–2006

Cigarettes per dayNon-Hispanic whiteNon-Hispanic blackN
NGeometric meanLower CLUpper CLNGeometric meanLower CLUpper CL
1–37432.723.246.16494.472.2123.6104
4–9191100.986.9117.2200194.6177.9212.9135
10–16408195.3184.2206.9160263.9243.6285.983
17+706239.7228.4251.5140292.2265.6321.454