Table 2.

Performance level of WCST.

		PD non-MCI		PD-MCI
		Time 1	Time 2	Time 1	Time 2
Error rate (%)	Control	2.7±3.0	3.2±2.7	2.8±4.3	4.5±4.2
	WCST	13.3±6.5	13.8±8.9	19.2±6.9	15.9±7.1
Reaction time (sec)	Control	2.45±0.76	2.58±0.73	2.50±0.56	3.17±1.25
	After positive feedback	2.64±0.64	2.89±0.74	2.88±0.55	3.16±1.15
	After negative feedback	3.05±0.53	3.39±0.81	3.41±0.86	3.85±1.80