Table 1.

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).