| Risk factors | Number of cases | Percentage (%) |
| Prolonged immobilization | 24 | 32 |
| Age > 60 ans | 23 | 31 |
| Adiposity (BMI ≥ 30) | 17 | 23 |
| Pregnancy and Postpartum | 15 |
|
| Recent surgery | 9 | 12 |
| Past history of Deep vein thrombosis and pulmonary embolism | 9 | 12 |
| Oral contraceptives | 8 | 11 |
| Malignant neoplasia | 7 | 9,5 |
| Limbs trauma | 3 | 4 |