| Population Characteristics | Number (N = 77) | % | |
| Age Average | 53 years [41 - 70] |
| |
| Gender | F | 19 | 25 |
| M | 58 | 75 | |
| Socio-economic level | Low | 13 | 17 |
| Average | 33 | 43 | |
| High | 31 | 40 | |
| Tobacco abuse |
| 70 | 91 |
| Alcohol abuse |
| 48 | 62 |
| Professional exposure |
| 2 | 2.6 |
| Family history |
| 2 | 2.6 |