Figure 4. Performance of the Wells clinical risk score for detecting all episodes of deep venous thrombosis. Two results are plotted from each study of the Wells score on the receiver-operating characteristic plane. Circles represent use of a high versus intermediate and low decision threshold (that is, only persons categorized as at high risk receive a diagnosis of deep venous thrombosis). Triangles represent a high and intermediate versus low decision threshold (that is, persons categorized as at high or intermediate risk receive a diagnosis of deep venous thrombosis). The point estimates and 95% CIs for pooled sensitivity and specificity for the 2 thresholds are also plotted as boxes.

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