Table 1.

Characteristics of the study participants

Surface workers (n = 50)Underground workers (n = 50)
Age (y), median (range)38 (20-54)40 (24-54)
Minimum time in current occupation5 mo2 y
Weeks off work in the past 6 mo, median (range)1 (1-10)1 (1-12)
Cigarette smokers3134
Lubricating oil on hands most days at work2519
Grilled/broiled meat or fish at least weekly85
Regular use of open fire2011