Table 2. Evaluation standard of cognitive function in study subjects.

Evaluation standard		Total (n = 242)	MCI (n = 36)	Normal (n = 206)	p-value
K-MMSE		26.12 ± 2.39	25.53 ± 0.38	26.23 ± 0.16	0.098
Neurocognitive assessment
	Delayed verbal score	9.21 ± 3.49	4.72 ± 0.47*	10.00 ± 0.19	< 0.001
	Delayed visual score	10.54 ± 2.76	6.50 ± 0.37*	11.25 ± 0.15	< 0.001
	Verbal score	49.85 ± 5.95	47.12 ± 1.01*	50.33 ± 0.41	0.004
	Visual score	45.44 ± 5.82	45.48 ± 0.98	45.44 ± 0.41	0.969
	Executive score	32.22 ± 21.57	30.44 ± 3.24	32.52 ± 1.32	0.555
	Reasoning score	−0.25 ± 8.10	−1.73 ± 1.37	0.00 ± 0.56	0.243

MCI group is defined as the subjects with an average score of 16 percentiles or less between the delayed verbal scores and delayed visual scores. Data are least square means ± standard deviation.

MCI, mild cognitive impairment; K-MMSE, Korean version of Mini-Mental State Examination;

^*Statistical difference between the MCI group and normal group adjusted age by GLM univariate analysis at p < 0.01.