TABLE 3

Geometric Mean and Regression Results of Log Cotinine: Ratio of Geometric Means (95% CI) Among Nonsmoking Youth Aged 3 to 19 Years, 2003–2006

ParameternGM (95% CI), ng/mlUnadjustedAdjusted (Model 1)Adjusted (Model 2)
Ratio of GM (95% CI)PRatio of GM (95% CI)PRatio of GM (95% CI)P
All nonsmoking youth56370.096 (0.079–0.116)
    No law33170.128 (0.098–0.166)1.001.001.00
    Limited6810.067 (0.013–0.360)0.54 (0.41–0.71)<.0010.83 (0.59–1.16).2401.03 (0.71–1.51).860
    Extensive16390.051 (0.034–0.077)0.38 (0.26–0.55)<.0010.47 (0.33–0.67)<.0010.58 (0.42–0.79).002
Nonsmoking homes45820.054 (0.048–0.060)
    No law25840.068 (0.058–0.080)1.001.001.00
    Limited5630.046 (0.012–0.169)0.66 (0.53–0.81)<.0010.83 (0.65–1.07).1400.95 (0.71–1.27).710
    Extensive14350.033 (0.026–0.042)0.46 (0.37–0.59)<.0010.50 (0.37–0.67)<.0010.57 (0.41–0.79).002
Smoking homes10121.058 (0.878–1.276)
    No law7241.132 (0.881–1.455)1.001.001.00
    Limited940.903 (0.299–2.725)0.82 (0.63–1.06).1200.89 (0.75–1.06).1700.94 (0.74–1.19).580
    Extensive1940.835 (0.554–1.258)0.71 (0.48–1.04).0700.96 (0.74–1.26).7600.98 (0.75–1.28).860
  • Model 1 adjusted for survey cycle, gender, age, race, ratio of income to poverty, region, and restaurant visits per week; model 2 additionally adjusted for adult county smoking prevalence. GM indicates geometric mean.