Results
CC between low-, intermediate- and high-risk groups on their own and a final diagnosis of PE on imaging was 0.1332, 0.1278 and 0.0817, respectively. By contrast, the CC when using positive DD was higher for all categories: 0.7527, 0.6256 and 0.4195, respectively. For the age-adjusted DD, the correlations were higher than for the clinical prediction score but less than for the absolute DD; calculated at 0.6490, 0.4987 and 0.3550 for the respective groups. The overall CC for risk category was 0.1107; for a positive DD, it was 0.7033; for the age-adjusted DD, it was 0.5928.