Chronic lymphocytic leukaemia risk associated with individual and combined ever exposure to benzene, toluene and xylene
| Benzene | Toluene | Xylene | |
| Case/controls OR 95% CI | Case/controls OR 95% CI | Case/controls OR 95% CI | |
| All exposed | 70/295 1.5 1.1 to 2.2 | 65/333 1.5 1.0 to 2.1 | 61/309 1.5 1.0 to 2.2 |
| Isolated exposure | 19/62 1.8 1.0 to 3.2 | 1/23 0.4 0.1 to 3.0 | 1/1 11.3 0.7 to 198 |
| Unexposed to benzene | – | 14/103 1.3 0.7 to 2.4 | 14/81 1.7 0.9 to 3.3 |
| Unexposed to toluene | 19/65 1.7 1.0 to 3.0 | - | 1/4 2.0 0.2 to 21 |
| Unexposed to xylene | 23/67 2.0 1.2 to 3.5 | 5/28 1.5 0.5 to 4.0 | – |