| Risks factors | Frequency (%) |
| Medical risk factors |
|
| Hypertension | 36 (35) |
| Cancer | 19 (18.4) |
| Past history of deep venous thrombosis | 15 (14.6) |
| Myocardiopathy | 10 (9.7) |
| Diabetes | 9 (8.7) |
| HIV infection | 8 (7.8) |
| Arrhythmia | 7 (6.8) |
| Chronic Kidney disease | 5 (4.9) |
| Autoimmune disease | 3 (2.9) |
| Recent infection | 3 (2.9) |
| Sickle cell disease | 2 (1.9) |
| Stroke | 1 (1) |
| Pulmonary tuberculosis | 1 (1) |
| Varicose veins | 1 (1) |
| Surgical and gynecological risk factors |
|
| Recent surgery | 16 (15.5) |
| Post partum | 2 (1.9) |
| Pregnancy | 1 (1) |
| Abortion | 1 (1) |
| Other risk factors |
|
| Obesity | 51 (49.5) |
| Long trip | 25 (24.3) |
| Smoking | 18 (17.5) |
| Immobility | 17 (16.5) |
| Hormone therapy replacement | 6 (5.8) |