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Figure 3 The analysis of New York Heart Association (NYHA) functional class before (dotted bars) and 6 to 12 months after (solid bars) radiofrequency catheter ablation (RFA). Before ablation, NYHA functional class was significantly worse in accordance with frequency of premature ventricular complex (%PVC); RFA significantly improved NYHA functional class in each group compared with before intervention. **p < 0.01, *p < 0.05 versus before RFA in each group. p < 0.05 versus the lower and middle groups in each period. Values are mean ± SD.