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. 2012 Dec 5;7(12):e50576. doi: 10.1371/journal.pone.0050576

Table 1. Summary Statistics.

Variable Mean/Proportion Std Dev Min Max
Tobacco Use (Binary) 0.25 0 1
Number of Cigarettes Daily 3.73 8.76 0 140
Number of Cigarettes Daily (Among Smokers) 15.2 11.78 1 140
Cotinine (ng/ml) 68.41 139.29 0.35 1890
Age (years) 42.83 17.09 17 90
Female 0.52 0 1
White Race 0.75 0 1
Black race 0.10 0 1
Hispanic ethnicity 0.10 0 1
Other Race 0.05 0 1
Education (years) 12.52 3.06 0 17
Income ($1000 s) 35.32 18.39 0 60
Married 0.61 0 1
Missing Information on Demographic Characteristics 0.06 0 1
State Level Tobacco Use Rate 0.25 0.04 0.17 0.34
Cigarette Tax Level (cents per pack) 24.53 11.34 2.0 56.0
SNP:
rs2304297 =  = “CC” 0.11 0 1
rs2304297 =  = “CG” 0.38 0 1
rs2304297 =  = “GG” 0.51 0 1

NHANES 1991–1994 Genetic Sample (N = 6,178).

Notes: Author’s calculations from NHANES Data. Sample weights used.