The absence of `minor' risk factors for recurrent venous thromboembolism: a systematic review of negative predictive values and negative likelihood ratios

BACKGROUND: The decision to stop anticoagulation after an episode of venous thromboembolism (VTE) depends on the risk of recurrence. A number of recently discussed risk factors that are not routinely used in clinical practice might be useful for the identification of patients with a low risk of recurrence. OBJECTIVES: The aim of this study was to determine the negative predictive value and likelihood ratio of the absence of each of these …