Secondary risk factors of VTE

patient n (%)

Trauma and/or surgery

Malignant tumor

History of venous thrombosis

Old age (>75 years)

Antiphospholipid antibody positive

Stroke sequelae long-term bed rest

Varicose veins of lower extremities

Steroid hormone application

Long term oral contraceptive

Hyperhemoglobinemia

Peripheral venous catheterization

52 (48.1)

22 (20.3)

18 (16.7)

17 (17.7)

13 (12.0)

9 (8.3)

8 (7.4)

7 (6.5)

4 (3.7)

2 (1.8)

2 (1.8)