Table 3

 Hazard ratio estimates of nasopharyngeal carcinoma in relation to the occupational exposures classified by job exposure matrix

ExposureCasesNon-casesHR*95% CI
*Adjusted for age at baseline only.
Cotton dust
    <1 year1912471.0Reference
    ⩾1 year4819401.8(1.1 to 3.2)
Wool dust
    <1 year6127421.0Reference
    ⩾1 year64450.6(0.3 to 1.5)
Silk dust
    <1 year6430271.0Reference
    ⩾1 year31600.9(0.3 to 3.0)
Synthetic fibre dust
    <1 year4219301.0Reference
    ⩾1 year2512570.9(0.5 to 1.5)
Non-textile dust
    <1 year6126741.0Reference
    ⩾1 year65130.5(0.2 to 1.2)
Solvents
    <1 year5327391.0Reference
    ⩾1 year144481.3(0.7 to 2.5)
Bleaching agents
    <1 year6431421.0Reference
    ⩾1 year3452.4(0.7 to 8.2)
Acids, bases, and caustics
    <1 year5629291.0Reference
    ⩾1 year112581.8(0.9 to 3.6)
Dyes
    <1 year6230921.0Reference
    ⩾1 year5952.1(0.8 to 5.5)
Inks
    <1 year6331581.0Reference
    ⩾1 year4295.0(1.6 to 15.4)
Pesticides
    <1 year6531421.0Reference
    ⩾1 year2451.9(0.4 to 8.1)
Endotoxin
    <1 year4223111.0Reference
    ⩾1 year258761.6(0.9 to 2.6)