Table 1
Sex, age, smoking, and duration of employment of the employees
Sex
Age (y)
Smoking
Duration of employment (y)
Men
Women
Men
Women
Mean
Range
Mean
Range
n
%
⩽10
>10
Process workers (n=40)
26
14
42
20–59
47
24–60
14
35
16
24
Office workers (n=36)
7
29
47
30–60
41
26–56
13
36
22
14