Table 2

 Selected centiles of cotinine concentrations (ng/ml) for non-smoking adults by smoke-free law coverage category

Sample sizeSelected centiles (95% CI)
50th75th90th95th
*<LOD (less than the limit of detection: 0.05 ng/ml).
Total5866<LOD*0.10 (0.08 to 0.11)0.31 (0.27 to 0.39)0.67 (0.60 to 1.84)
Smoke-free law coverage category
    No law4026<LOD0.12 (0.10 to 0.13)0.37 (0.32 to 0.47)0.78 (0.70 to 1.92)
    Limited503<LOD0.09 (0.04 to 0.13)0.24 (0.14 to 0.37)0.53 (0.28 to 1.62)
    Extensive1337<LOD<LOD0.07 (0.03 to 0.12)0.16 (0.11 to 1.49)