Table 3: IPSET-thrombosis Score according to Barbui, et al., Blood 2011.

Risk factors

Score

·        Age over 60 years

1

·        Cardiovascular risk factors

1

·        History of thrombosis

2

·        JAK2 V617F Mutation

2

Low risks (total score = 0-1, annual incidence of thrombosis 0.5 à 1.19%), intermediate (total score = 2, annual incidence of thrombosis 1.76 à 2.35%) and high (total score ≥ 3, annual incidence of thrombosis 2.28 à 4.88%).