Table 2.

Spearman's correlation coefficient between EMG reaction time parameters with clinically measured data by UPDRS part III scores.

		Spearman's correlation coefficient between RT and UPDRS part III motor scores
		More-affected side			Less-affected side
		Wrist flexor	Wrist extensor	Ankle flexor	Wrist flexor	Wrist extensor	Ankle flexor
RTi	Sum of UPDRS III	0.382*	0.407*	0.440*	0.472**	0.314	0.371*
	Bradykinesia	0.312	0.497*	0.338	0.377*	0.363*	0.215
	Rigidity	0.043	0.120	0.327	0.566**	0.291	0.306
	Tremor	0.367	0.070	0.444*	0.439*	0.351	0.397*
RTt	Sum of UPDRS III	0.392*	0.462**	0.640**	0.524**	0.417*	0.470**
	Bradykinesia	0.428*	0.261	0.530*	0.373*	0.446**	0.375*
	Rigidity	0.383*	0.459*	0.216	0.474**	0.434**	0.375*
	Tremor	0.122	0.103	0.362*	0.142	0.283	0.230

*The mean difference is significant at the 0.05 level.

**The mean difference is significant at the 0.01 level.

UPDRS: Unified Parkinson's Disease Rating Scale; UPDRS part III: sum of motor part score of UPDRS; RTi: reaction time (initiation delay of muscle contraction); RTt: reaction time (termination delay of muscle contraction).