Variables of interest with corresponding data source
| Venous duplex ultrasound report | Phone survey | Patient chart |
| Study date | Race | Sex |
| Study indication | Ethnicity | Height |
| Reflux location(s) | History of VLU (including ulcer start date) | Weight |
| Reflux time(s) | Limitation of ankle movement | Venous dermatitis |
| Presence of DVT or superficial vein thrombosis | Mobility (ie, use of a wheelchair or walker) | Lipodermatosclerosis |
| History of DVT or PE | Atrophie blanche | |
| History of varicose veins | Medical and surgical history | |
| History of leg swelling | Ulcer photograph | |
| Chronic itch of lower extremities | ||
| Chronic rash of lower extremities | ||
| Lower extremity vein procedures | ||
| Lower extremity artery procedures | ||
| Use of compression on lower extremities | ||
| Elevation of legs when sleeping | ||
| No of pregnancies | ||
| Other medical and surgical history | ||
| Medications | ||
| Smoking history | ||
| Exercise | ||
| Family history of leg ulcers, swelling or varicose veins |
DVT, deep vein thrombosis; PE, pulmonary embolism; VLU, venous leg ulcer.