Table 2.

Analysis of PDR waves frequency and amplitude of the EEG recordings among MS patients and controls.

PDR parameters	MS patients	Controls	P value
PDR frequency (Mean ± SD)	8.680 ± 1.587	10.307 ± 0.979	.000∗∗
Amplitude of PDR (Mean ± SD)	41.060 ± 20.693	51.618 ± 21.226	.013∗

Unite of measurement for PDR waves frequency is Hertz (Hz) while the measurement unites of PDR waves amplitude is μ volt (μv). Data shown are mean value ± SD (n = 50, t test, ^∗P value ≤.05, ^∗∗P value ≤.001(.

EEG = electroencephalography, MS = multiple sclerosis, PDR = posterior dominant rhythm, SD = standard deviation.