Geometric means (and geometric SD) of urinary analytes before and after 6 h of work
| Levels of urinary analytes (ng/l) | Before work (n=18) | After work (n=17) |
| 1-OH-napthalene | 992 (4) | 2553 (2)* |
| 2-OH-naphthalene | 2670 (2) | 3984 (2) |
| 9-OH-phenanthrene | 441 (4) | 1033 (2)* |
| 2-OH-fluorene | 672 (3) | 1541 (3)* |
| 1-OH-pyrene | 361 (3) | 692 (2)* |
| 8-OHd-guanosine (μg/l) | 9 (4) | 40 (2)* |
↵* p<0.05 when compared with samples collected before work (using Student t test).