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CNV parameters, including (a) late CNV, (b) peak CNV and (c) CNV area of normal and LBP groups, which recorded at each channel separately. Significant values (P < 0.05) are represented by asterisks. By convention, negative voltage is plotted upward. Fz frontal, Cz central, and Pz parietal midline channels, µV microvolt, and mV.ms millivolt.millisecond. Results are represented as mean ± SEM
