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Figure 2 Regression lines (solid line = group 1; dashed line = group 2) show a fairly good correlation between the magnitude of interventricular delay decrease (IVD) and magnitude of ejection fraction increase (EF) (top) and left ventricular end-systolic diameter decrease (LVESD) (bottom) in group 1 (open squares) but not in group 2 (solid triangles) after cardiac resynchronization therapy. = follow-up – baseline absolute difference. *p value based on analysis of covariance.