Table 3. p-values obtained on comparing the TMS parameters between the study groups.

	PDD vs	PDD vs	PDD vs	PD-MCI vs	PD-MCI	PD-nC
	PD-MCI	PD-nC	HC	PD-nC	vs HC	vs HC
RMT	1.00	1.00	1.00	1.00	1.00	1.00
CMCT	1.00	1.00	1.00	1.00	1.00	1.00
cSP	1.00	1.00	1.00	1.00	1.00	1.00
iSP	1.00	0.93	0.64	1.00	1.00	1.00
SICI	0.05 *	0.00 **	0.00 **	0.01 *	0.00 **	0.27
ICF	0.05 *	0.00 **	0.00 **	0.05 *	0.00 **	0.00 **

^*p < 0.05,

^**p < 0.01 (Tukey-HSD). CMCT: central motor conduction time, cSP: contralateral silent period, HC: healthy controls, ICF: intracortical facilitation, iSP: ipsilateral silent period, PD-nC: Parkinson’s disease without cognitive impairment, PDD: Parkinson’s disease with dementia, PD-MCI: Parkinson’s disease with mild cognitive impairment, RMT: resting motor threshold, SICI: short interval intracortical inhibition