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HRV indices that significantly correlated with FO/ECW% index during the first 30 minutes of HD treatment. Figures A, B, C and D depict the results of the correlation analysis with the regression lines for all 69 patients for SDANN, VLF, HF% and LZC (3,0.01) indices, and the correlation coefficients were r = –0.39, r = –0.39, r = 0.29 and r = –0.26, respectively. The histograms of HRV parameter distributions are shown on the left of each panel.
