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Major Risk Factors in this Study.
| Factors | Score | n (%) |
|---|---|---|
| Age, years | ||
| <40 | 0 | 59 (12.7) |
| 40-59 | 1 | 241 (51.7) |
| 60-74 | 2 | 152 (32.6) |
| ≥75 | 3 | 14 (3.0) |
| Cancer | 3 | 466 (100.0) |
| Central venous access | 1 | 466 (100.0) |
| Present cancer or chemotherapy | 3 | 466 (100.0) |
| Major surgery lasting over 3 hours | 5 | 462 (99.1) |
| Blood transfusion | 1 | 429 (92.1) |
| History of venous thromboembolism | 3 | 39 (8.4) |
| History of major surgery | 1 | 14 (3.0) |
