Table 3 Patients characteristics of thromboembolic risk factors of the USA study

Family history of thromboembolic illness, n (%)

Yes

12 (1.2%)

No

993 (98.8%)

Missing

1

Evidence of predisposing conditions for a vascular or metabolic disease, n (%)

Yes

5 (0.5%)

No

1001 (99.5%)

Current smoker older than 35 years or non-smoker over 40 years old, n (%)

Yes

51 (5.1%)

No

955 (94.9%)

BMI > 30 kg/m²,n (%)

Yes

353 (35.1%)

No

653 (64.9%)

Number of VTE risk factors, n (%)

0

611 (60.8%)

1

367 (36.5%)

2

27 (2.7%)

≥3

0

Missing

1