Table 2

Cotinine measurements in 374 people* with information on exposure to environmental tobacco smoke

ETS statusMean (SD)Cotinine Detectable (<0.05 ng/ml)Undetectable
Yes (n=189)0.55 (0.96)89100
No (n=174)0.17 (0.49)37137
  • * Eleven people with cotinine concentration <10 ng/ml excluded.

  • † P<0.0001 for difference (Wilcoxon Rank sum test).