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. 2006 Jan;63(1):39–44. doi: 10.1136/oem.2005.021709

Table 4 Hazard ratio estimates of nasopharyngeal carcinoma in relation to the duration of occupational exposures classified by job exposure matrix.

Exposure Cases Non‐cases HR* 95% CI p for trend
 
Cotton dust
 Never 19 1232 1.0 Reference
 <10 years 12 292 2.7 (1.3 to 5.7)
 ⩾10 years 36 1663 1.6 (0.9 to 2.9) 0.33
Wool dust
 Never 61 2737 1.0 Reference
 <10 years 1 94 0.5 (0.1 to 3.8)
 ⩾10 years 5 356 0.7 (0.3 to 1.7) 0.29
Synthetic fibre dust
 Never 42 1922 1.0 Reference
 <10 years 6 238 1.1 (0.5 to 2.6)
 ⩾10 years 19 1027 0.8 (0.5 to 1.4) 0.52
Solvents
 Never 52 2729 1.0 Reference
 <10 years 6 169 1.5 (0.6 to 3.6)
 ⩾10 years 9 289 1.4 (0.7 to 2.8) 0.30
Bleaching agents
 Never 64 3141 1.0 Reference
 <10 years 1 16 2.0 (0.3 to 15.7)
 ⩾10 years 2 30 2.6 (0.6 to 11.4) 0.20
Acids, bases, and caustics
 Never 55 2924 1.0 Reference
 <10 years 4 90 1.7 (0.6, 5.0)
 ⩾10 years 8 173 2.1 (1.0, 4.6) 0.05
Dyes
 Never 62 3091 1.0 Reference
 <10 years 3 30 3.3 (1.0 to 11.5)
 ⩾10 years 2 66 1.3 (0.3, 5.6) 0.32
Inks
 Never 63 3158 1.0 Reference
 <10 years 2 7 14.0 (2.6 to 74.0)
 ⩾10 years 2 22 3.0 (0.7 to 14.0) 0.05
Endotoxin
 Never 41 2303 1.0 Reference
 <10 years 5 170 1.6 (0.6 to 4.1)
 ⩾10 years 21 714 1.7 (1.0 to 2.9) 0.05

*Adjusted for age at baseline only.