Validation of Revised Chinese Version of PD-CRS in Parkinson’s Disease Patients

Table 2

Reliability and internal consistency for both total and individual item scores of PD-CRS.

Subscale	Test-retest reliability		Inter-rater reliability		Internal consistency
	ICC (95% CI)		ICC (95% CI)		Corrected item − total correlation	Cronbach’s alpha if the item is deleted
Immediate free-recall verbal memory	0.817 (0.747–0.867)	<0.001	0.692 (0.580–0.782)	<0.001	0.705	0.830
Confrontation naming	0.717 (0.554–0.844)	<0.001	0.709 (0.562–0.807)	<0.001	0.452	0.837
Sustained attention	0.810 (0.743–0.867)	<0.001	0.775 (0.667–0.857)	<0.001	0.704	0.829
Working memory	0.706 (0.571–0.808)	<0.001	0.650 (0.521–0.759)	<0.001	0.602	0.835
Clock drawing	0.728 (0.506–0.851)	<0.001	0.675 (0.449–0.822)	<0.001	0.629	0.834
Copying a clock	0.814 (0.423–0.925)	<0.001	0.826 (0.429–0.922)	<0.001	0.566	0.838
Delayed free-recall verbal memory	0.825 (0.743–0.894)	<0.001	0.748 (0.614–0.845)	<0.001	0.665	0.829
Alternating verbal fluencies	0.727 (0.608–0.815)	<0.001	0.592 (0.471–0.693)	<0.001	0.730	0.822
Action verbal fluencies	0.691 (0.562–0.796)	<0.001	0.720 (0.596–0.821)	<0.001	0.711	0.821
Frontal-subcortical functions	0.911 (0.865–0.939)	<0.001	0.893 (0.841–0.929)	<0.001	0.977	0.787
Instrumental-cortical functions	0.780 (0.632–0.870)	<0.001	0.789 (0.655–0.872)	<0.001	0.645	0.829
PD-CRS	0.906 (0.860–0.935)	<0.001	0.899 (0.848–0.933)	<0.001	Cronbach’s alpha = 0.840

PD-CRS: Parkinson’s disease-cognitive rating scale; ICC: intraclass correlation coefficients; CI: confidence interval.