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Table 3.

Association (estimated OR and 95% CL) between cumulative marijuana use and cancer incidence among subjects who never used cigarettes, by type of cancer, amount of marijuana use, and covariate adjustment

Cancer type (marijuana use)Cases, NControls, NCrude OR (95% CL)Adjusted OR (95% CL)
Model 1Model 2
Oral cancer      
    Never 57 294 
    >0 to <1 joint-years 25 138 0.93 (0.56, 1.6) 0.86 (0.51, 1.5) 0.93 (0.53, 1.6) 
    1 to <10 joint-years 11 34 1.7 (0.80, 3.5) 1.5 (0.68, 3.1) 1.5 (0.68, 3.5) 
    ≥10 joint-years 21 2.2 (0.96, 5.1) 2.0 (0.82, 4.7) 1.8 (0.69, 4.7) 
Pharyngeal cancer      
    Never 30 294 
    Ever 13 193 0.66 (0.34, 1.3) 0.61 (0.30, 1.2) 0.92 (0.41, 2.1) 
Laryngeal cancer      
    Never 296 
    Ever 193 1.3 (0.44, 4.0) 0.97 (0.31, 3.0) 1.2 (0.26, 5.5) 
Esophageal cancer      
    Never 14 293 
    Ever 192 0.98 (0.42, 2.3) 0.92 (0.37, 2.2) 0.79 (0.30, 2.1) 
Lung cancer      
    Never 91 291 
    >0 to <1 joint-years 10 136 0.24 (0.12, 0.47) 0.26 (0.13, 0.53) 0.44 (0.21, 0.92) 
    ≥1 joint-years 55 0.52 (0.25, 1.1) 0.63 (0.29, 1.4) 1.1 (0.48, 2.6) 
Cancer type (marijuana use)Cases, NControls, NCrude OR (95% CL)Adjusted OR (95% CL)
Model 1Model 2
Oral cancer      
    Never 57 294 
    >0 to <1 joint-years 25 138 0.93 (0.56, 1.6) 0.86 (0.51, 1.5) 0.93 (0.53, 1.6) 
    1 to <10 joint-years 11 34 1.7 (0.80, 3.5) 1.5 (0.68, 3.1) 1.5 (0.68, 3.5) 
    ≥10 joint-years 21 2.2 (0.96, 5.1) 2.0 (0.82, 4.7) 1.8 (0.69, 4.7) 
Pharyngeal cancer      
    Never 30 294 
    Ever 13 193 0.66 (0.34, 1.3) 0.61 (0.30, 1.2) 0.92 (0.41, 2.1) 
Laryngeal cancer      
    Never 296 
    Ever 193 1.3 (0.44, 4.0) 0.97 (0.31, 3.0) 1.2 (0.26, 5.5) 
Esophageal cancer      
    Never 14 293 
    Ever 192 0.98 (0.42, 2.3) 0.92 (0.37, 2.2) 0.79 (0.30, 2.1) 
Lung cancer      
    Never 91 291 
    >0 to <1 joint-years 10 136 0.24 (0.12, 0.47) 0.26 (0.13, 0.53) 0.44 (0.21, 0.92) 
    ≥1 joint-years 55 0.52 (0.25, 1.1) 0.63 (0.29, 1.4) 1.1 (0.48, 2.6) 

NOTE: Crude estimates are unadjusted for covariates. Model 1 was adjusted for age (four categories: ≤45, 46-50, 51-55, and 56-62) and gender. Model 2 was adjusted for age (four categories), gender, race/ethnicity (four categories), education (five categories), and drink-years.

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