Elastic compression stockings v no elastic compression stockings to prevent the post-thrombotic syndrome at mean 49 months in acute symptomatic proximal deep venous thrombosis (DVT)*

OutcomeElastic stockingsNo elastic stockingsAdjusted hazard ratio (95% CI)†NNT (CI)
*CI and NNT defined in glossary.
†Hazard ratio adjusted for age, sex, clinical presentation of DVT, thrombophilic status, extent of the index thrombotic episode, and use of unfractionated or low molecular weight heparin for initial treatment of thrombosis.
Post-thrombotic syndrome26%49%0.49 (0.29 to 0.84)5 (3 to 11)