Table 3 Hazard ratio estimates of nasopharyngeal carcinoma in relation to the occupational exposures classified by job exposure matrix.
| Exposure | Cases | Non‐cases | HR* | 95% CI |
|---|---|---|---|---|
| Cotton dust | ||||
| <1 year | 19 | 1247 | 1.0 | Reference |
| ⩾1 year | 48 | 1940 | 1.8 | (1.1 to 3.2) |
| Wool dust | ||||
| <1 year | 61 | 2742 | 1.0 | Reference |
| ⩾1 year | 6 | 445 | 0.6 | (0.3 to 1.5) |
| Silk dust | ||||
| <1 year | 64 | 3027 | 1.0 | Reference |
| ⩾1 year | 3 | 160 | 0.9 | (0.3 to 3.0) |
| Synthetic fibre dust | ||||
| <1 year | 42 | 1930 | 1.0 | Reference |
| ⩾1 year | 25 | 1257 | 0.9 | (0.5 to 1.5) |
| Non‐textile dust | ||||
| <1 year | 61 | 2674 | 1.0 | Reference |
| ⩾1 year | 6 | 513 | 0.5 | (0.2 to 1.2) |
| Solvents | ||||
| <1 year | 53 | 2739 | 1.0 | Reference |
| ⩾1 year | 14 | 448 | 1.3 | (0.7 to 2.5) |
| Bleaching agents | ||||
| <1 year | 64 | 3142 | 1.0 | Reference |
| ⩾1 year | 3 | 45 | 2.4 | (0.7 to 8.2) |
| Acids, bases, and caustics | ||||
| <1 year | 56 | 2929 | 1.0 | Reference |
| ⩾1 year | 11 | 258 | 1.8 | (0.9 to 3.6) |
| Dyes | ||||
| <1 year | 62 | 3092 | 1.0 | Reference |
| ⩾1 year | 5 | 95 | 2.1 | (0.8 to 5.5) |
| Inks | ||||
| <1 year | 63 | 3158 | 1.0 | Reference |
| ⩾1 year | 4 | 29 | 5.0 | (1.6 to 15.4) |
| Pesticides | ||||
| <1 year | 65 | 3142 | 1.0 | Reference |
| ⩾1 year | 2 | 45 | 1.9 | (0.4 to 8.1) |
| Endotoxin | ||||
| <1 year | 42 | 2311 | 1.0 | Reference |
| ⩾1 year | 25 | 876 | 1.6 | (0.9 to 2.6) |
*Adjusted for age at baseline only.