Association between head and neck cancer and exclusive exposure to combinations of chlorinated solvents
| Cases (n=284) | Controls (n=767) | OR* | 95% CI | |
|---|---|---|---|---|
| Never exposed to TRI, PER or MC | 246 | 693 | 1 | |
| TRI only | 20 | 32 | 1.81 | 0.81 to 4.04 |
| PER only | 0 | 3 | – | – |
| TRI and PER | 9 | 7 | 4.47 | 1.27 to 15.8 |
| MC only | 5 | 8 | 0.50 | 0.11 to 2.18 |
| TRI and MC | 8 | 18 | 1.66 | 0.58 to 4.77 |
| TRI and PER and MC | 1 | 3 | 2.16 | 0.19 to 24.1 |
*OR adjusted for age at interview, geographical area, alcohol and tobacco consumption.
MC, methylene chloride; PER, perchloroethylene; TRI, trichloroethylene.