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Figure 1 Summary receiver-operating characteristic (SROC) curves for the diagnostic performance of coronary magnetic resonance angiography against the gold standard of X-ray coronary angiography using segment-level (A), vessel-level (B), and subject-level (C) data. Each ellipse corresponds to a comparison. Within each panel the diameters of the ellipses are inversely proportional to the variance of the sensitivity (vertical diameter) and the variance of specificity (horizontal diameter) of each comparison. Also shown is the independently weighted sensitivity and specificity according to random effects calculations (x) as well as the 95% confidence intervals (box). Weighted SROC curves are shown with bold lines; unweighted SROC curves are shown by thin lines.