Table 1.

Comparison of clinical prediction models for recurrent venous thromboembolism.

Score	Variables	Inclusion Criteria	Definition of Unprovoked VTE	Findings—Risk of Recurrent VTE
DASH [11]	Abnormal D-dimer after AC Age ≤ 50 Gender Hormone therapy	First unprovoked VTE	Absence of: Surgery Trauma Active cancer Immobility Pregnancy and puerperium Included: Hormone therapy Thrombophilic blood abnormality (if no other VTE risks)	Annualised recurrence risk: Score ≤ 1:3.1% Score > 1:9.3%
HERDOO2 [8]	Gender Signs of post-thrombotic syndrome Abnormal D-dimer during on AC BMI ≥ 30 Age ≥ 65	First unprovoked VTE after 5–12 months of AC	Absence of: Major surgery within 3 months Malignancy within 5 years Immobilisation for ≥ 3 days Leg fracture or plaster cast Included: Travel-related Exogenous oestrogen Minor immobilisation Minor surgery	Annualised recurrence risk: Low-risk (0 or 1 factor) females: 1.6% High-risk (≥ 2 factors) females: 14.1% per year Males (no low-risk group identified): 13.7%
Vienna [9]	Gender VTE location D-dimer after ceasing AC	First unprovoked VTE after at least 3 months of AC	Absence of: Major surgery Major trauma Pregnancy Female hormone intake Hereditary thrombophilia Malignancy Included: Immobility	Continuous HR based on nomogram

BMI: body mass index; HR: hazard ratio; AC: anticoagulation; VTE: venous thromboembolism.