Table 2.
Characteristics of drivers and unexposed group.
| Drivers (no. = 280) | Non drivers (no. = 120) | Test of sig. | P value | |||
|---|---|---|---|---|---|---|
| No. | % | No. | % | |||
| Age (Y), | 42.80 ± 9.69 | 43.86 ± 6.74 | t = 1.26 | 0.208 | ||
|
| ||||||
| Residence | ||||||
| Urban | 190 | 67.9 | 90 | 75.0 |
χ
2
2.04 |
0.153 |
| Rural | 90 | 32.1 | 30 | 25.0 | ||
|
| ||||||
| Education | ||||||
| Basic | 56 | 20.0 | 36 | 30.0 |
χ
2
7.21 |
0.027 |
| Secondary | 200 | 71.4 | 80 | 66.7 | ||
| University | 24 | 8.6 | 4 | 3.3 | ||
|
| ||||||
| Income | ||||||
| Enough | 132 | 47.1 | 58 | 48.3 | 0.04 | 0.827 |
| Not enough | 148 | 52.9 | 62 | 51.7 | ||
|
| ||||||
| Marital status | ||||||
| Single | 100 | 35.7 | 40 | 33.3 | 0.20 | 0.647 |
| Married | 180 | 64.3 | 80 | 66.7 | ||
|
| ||||||
| Smoking | ||||||
| Smokers | 196 | 70.0 | 67 | 55.8 |
χ
2
7.48 |
0.006∗ |
| Nonsmokers | 84 | 30.0 | 53 | 44.2 | ||
|
| ||||||
| Duration of driving work (years) | ||||||
| 10 | 40 | 14.3 | — | — | — | |
| ≥10 | 240 | 85.7 | ||||
|
| ||||||
| Driving work hours/day | ||||||
| <8 | 26 | 9.0 | — | — | — | |
| ≥8 | 264 | 91.0 | ||||
∗Significant.