Table 2.

Characteristics of HNC cases and controls

Cases
Controls
TotalNo. ever marijuana smokers*% ever marijuana smokersTotalNo. ever marijuana smokers*% ever marijuana smokers
Total4,02940810.15,01574414.8
Study
    Seattle4076816.760710317.0
    Tampa20752.489740.4
    Los Angeles41624458.71,00254354.2
    Houston829495.9865647.4
Latin America
    Buenos Aires33400.018852.7
    Havana19610.517621.1
    Goiania39171.824241.7
    Pelotas12810.822500.0
    Porto Alegre19121.015210.7
    Rio de Janeiro428122.824172.9
    Sao Paulo502193.8420112.6
Age categories
    <401623924.13479025.9
    40-<452815318.945513128.8
    45-<5052611521.964315624.3
    50-<556909513.894520822.0
    55-<608059211.499213613.7
    ≥601,565140.91,633231.4
Sex
    Women785668.41,54721313.8
    Men3,24434210.53,46853115.3
Race
    White non-Hispanic1,52628018.32,68455820.8
    Black1455235.92717126.2
    Hispanic1412719.13286820.7
    Asian + other471021.3881719.3
    Latin American2,170421.91,644301.8
Education
    <Junior high school1,722462.71,310292.2
    Some high school4416615.03904912.6
    High school graduate4757716.266612819.2
    Vocational, some college60612620.81,15924220.9
    ≥College4809018.81,27829623.2
    Missing30531.0212
Tobacco smoking status
    Never4935711.61,81322112.2
    Ever3,5363519.93,19652216.3
    Missing61
Alcohol drinking status
    Never568346.01,505805.3
    Ever3,45737310.83,50666318.9
    Missing4141
  • * Ever marijuana smoking was defined differently in the studies: the Seattle, Houston, and Los Angeles studies (“ever” use), Latin America study (≥once per week for 6 mo), and Tampa study (≥once per day for 1 y).

  • The Latin America study did not assess race/ethnicity; thus, we classified the subjects as a separate category “Latin Americans.”.