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Individual and job-related characteristics of the population under study (n = 802)
| n (%) | |
| Sex | |
| Male | 763 (95.1) |
| Female | 39 (4.9) |
| Age (yr) | |
| < 40 | 407 (50.7) |
| 40-50 | 301 (37.5) |
| > 50 | 94 (11.7) |
| Marital status | |
| Married | 63 (7.9) |
| Single | 739 (92.0) |
| Basic education | |
| University/PhD | 83 (10.3) |
| Technical school | 503 (62.7) |
| Elementary/high school | 216 (27) |
| Specialty | |
| White-collar workers | 91 (11.3) |
| Blue-collar workers | 711 (88.7) |
