Table 2. Internal consistency and test-retest reliability of the K-ECog.

K-ECog	Chronbach's α	1st	2nd	Pearson's r	P value
Memory	0.88	1.56 ± 0.60	1.49 ± 0.62	0.82	< 0.001
Language	0.89	1.32 ± 0.49	1.28 ± 0.42	0.67	< 0.001
Visuospatial function	0.76	1.29 ± 0.47	1.27 ± 0.40	0.74	< 0.001
EF: planning	0.76	1.34 ± 0.48	1.30 ± 0.46	0.79	< 0.001
EF: organization	0.77	1.33 ± 0.49	1.29 ± 0.44	0.49	< 0.001
EF: divided attention	0.78	1.56 ± 0.62	1.50 ± 0.57	0.72	< 0.001
Global function	0.93	1.39 ± 0.43	1.35 ± 0.40	0.73	< 0.001

Values are presented as mean ± standard deviation.

K-ECog = Korean-Everyday Cognition, EF = executive function.