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Table 3 Number of studies for potential factors
| Endpoint | VTE* |
|---|---|
| Total of the endpoint | 54 |
| Risk factors | N † (%) |
| Demographic factors | |
| Age | 12 (22%) |
| Gender | 13 (24%) |
| BMI | 6 (11%) |
| Race | 1 (2%) |
| ASA physical status | 3 (6%) |
| Clinical factors | |
| Underlying diagnosis | 3 (6%) |
| Comorbidity (Charlson index) | 3 (6%) |
| Cardiovascular disease | 10 (19%) |
| Respiratory disease | 2 (4%) |
| Neurological disease | 1 (2%) |
| Liver and kidney disease | 2 (4%) |
| Metabolic disease | 7 (13%) |
| Hematological disease | 2 (4%) |
| Endocrine disease | 2 (4%) |
| Malignancy | 4 (8%) |
| Medication (hormone replacement/herbal) | 3 (6%) |
| Laboratory indexes | |
| Preoperative laboratory index | 2 (4%) |
| Postoperative laboratory index | 2 (4%) |
| Health care provider- related factors | |
| Surgery type | 12 (22%) |
| Surgical technic | 5 (9%) |
| Operating time | 4 (8%) |
| Anesthesia | 5 (9%) |
| Bleeding | 1 (2%) |
| Hospital volume | 2 (4%) |
| Insurance type | 1 (2%) |
| Thromboprophylaxes | |
| Chemoprophylaxis | 28 (52%) |
| Initiating and lasting of the prophylaxis | 4 (8%) |
| Mechanical and physical prophylaxis | 5 (9%) |
