Table 2.

Mean serum cotinine level (ng/mL) in cases and controls by sex, attained age, duration of follow-up, and smoking status

CasesControlsF*P > F
Sex
    Men293.9134.8762.8<0.0001
    Women262.897.2275.7<0.0001
Attained age (y)
    ≤60296.5121.4589.1<0.0001
    >60275.9130.3430.8<0.0001
Duration of follow-up (y)
    <10274.1112.1320.8<0.0001
    ≥10292.6131.9704.6<0.0001
Smoking status
    Never smoker10.711.50.640.43
    Ex smoker95.722.111.20.003
    Current smoker311.4247.884.0<0.0001
    Ever smoker338.0264.66.20.04
    Missing276.875.667.1<0.0001
  • * Unbalanced ANOVA.