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Figure 4 Mean angina grades before and after non-randomized intervention. Panels A and B show data for the percutaneous transluminal coronary angioplasty (PTCA) group. Panels C and D show data for the medical group. Lines are smoothed averages and 95% confidence intervals. The circles show individual data points. Continued on next page. For the medical group (C and D), the triangle indicates angina grade immediately before non-randomized intervention. CABG = coronary artery bypass graft.
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