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Pearson’s correlation showing the relationship between the source strength of the non-IED group activities and the duration of epilepsy. Source strength was found to be positively correlated with the duration of epilepsy in the 30–80 Hz band (p < 0.05, r = 0.638). Correlation between the two variables is plotted in the sample coordinate (last row) with source strength as abscissa and the duration of the disease as ordinate.
