| Medical history | Number (%) |
| Hypertension | 5 (14%) |
| Diabetes mellitus | 2 (6%) |
| Atrial fibrillation | 2 (6%) |
| Sick sinus syndrome | 1 (3%) |
| Chronic rheumatoid arthritis | 1 (3%) |
| Angina pectoris | 1 (3%) |
| Cerebral infarction | 1 (3%) |
| Chronic renal failure | 1 (3%) |
| Hepatic failure | 1 (3%) |
| Duodenal ulcer | 1 (3%) |
| Gastric ulcer | 1 (3%) |
| Parkinson’s disease | 1 (3%) |
| No history | 19 (54%) |
| Socio-demographic characteristics | Number (%) |
| Unemployed | 31 (88.5) |
| Office worker | 2 (5.7) |
| President of a company | 1 (2.9) |
| Electric constructor | 1 (2.9) |