Data collection by timepoints
| Timepoint | Data collection questions and instruments |
| Preoperative | Current anticoagulation use (yes/no and drug) Age Sex Joint (hip or knee) Side Unilateral vs bilateral Primary or revision ASA grade BMI History of VTE Oxford Hip or Knee Score EQ-5D-5L EQ-VAS Joint pain (numeric rating scale 0–10) |
| 90 days | VTE (DVT or PE) Adherence (did you use pills or injections to prevent a blood clot postoperatively, for how long?) Current use of anticoagulants (yes/no, which one) Non-VTE complications (readmission, readmission reason, reoperation, reoperation reason, major bleeding, death) |
| 6 months | Non-VTE complications (reoperation, reoperation reason, death) Oxford Hip or Knee Score EQ-5D-5L EQ-VAS Joint pain (numeric rating scale 0–10) |
ASA, American Society of Anaesthesiologists; BMI, body mass index; DVT, deep venous thrombosis; EQ-5D-5L, EuroQol-5D-5L; EQ-VAS, EuroQol-visual analogue scale; PE, pulmonary embolus; VTE, venous thromboembolism.