Monitoring of exposure to benzene in outdoor and indoor workers in Rome: main characteristics of the study subjects
| Group | n | Sex (m/f) | Age (y) mean (SD) | Years of employment mean (SD) |
| Traffic police | 139 | 104/35 | 41.5 (7.5) | 12.3 (6.7) |
| Office police | 63 | 45/18 | 45.0 (7.5) | 11.4 (6.6) |
| Total | 202 | 149/53 | 42.6 (7.7) | 12.0 (6.7) |