Table 1.
Demographic characteristics of the study participants
| Variable | Unexposed group (n = 200) (Mean ± SD) |
Exposed group (n = 200) (Mean ± SD) |
p |
|---|---|---|---|
| Male | 194 | 194 | |
| Female | 6 | 6 | |
| Age (y) | 35 ± 8.5 | 33.9 ± 9.4 | 0.23∗ |
| Length of exposure or employment (y) | 10.4 ± 7.8 | 6.75 ± 6.32 | <0.001∗ |
| Body mass index (kg m−2) | 25.4 ± 3.9 | 24.2 ± 3.9 | 0.007∗ |
| Number of smokers (%) | 27 (13.5) | 49 (24.5) | <0.001† |
| Length of smoking (y) | 11 ± 6 | 10.5 ± 8.6 | 0.7∗ |
SD, standard deviation.
∗
Independent sample t test.
†
Chi-square test.