Frequency table of risk factors mentioned by interviewed physicians
| Factors (k) | Levels | Type of risk factor | Freq. (%) |
| Idiopathic | no – yes | TR | 13 (100) |
| VTE type | distal DVT – proximal DVT – non-massive PE – massive PE | TR | 13 (100) |
| Thrombophilia | none – acquired – inherited | TR | 11 (85) |
| History of bleeding | no – yes | BR | 10 (77) |
| On concurrent antithrombotic medication (eg, aspirin) | no – yes | BR | 9 (69) |
| Age | <65 – >65 | BR/TR | 8 (62) |
| Renal function | normal – insufficient | BR | 7 (54) |
| Liver disease | no – yes | BR | 7 (54) |
| Unstable or high INR | no – yes | BR | 7 (54) |
| History of thrombosis | no – yes | TR | 6 (46) |
| BMI | underweight – normal weight – overweight | BR/TR | 5 (38) |
| Uncontrolled hypertension | no – yes | BR | 5 (38) |
| Alcohol or drug abuse | no – yes | BR | 5 (38) |
| Family history of VTE | no – yes | TR | 4 (31) |
| Physical activity | sedentary – active | TR/BR | 4 (31) |
| Thrombocytopenia | no - yes | BR | 3 (23) |
| Signs of PTS | no – yes | TR | 3 (23) |
| Sex | female – male | TR | 2 (15) |
BMI, body mass index; BR, bleeding risk; INR, internationalnormalised ratio; PTS, post-thrombotic syndrome; TR, thrombotic risk (ie, VTE recurrence risk); VTE, venous thromboembolism.