Table 2. Comparison of neuropsychological test results at baseline and 21 days after operation.

Index	Baseline			21 days after operation
	POCD	Non-POCD	P	POCD	Non-POCD	P
Verbal learning test-revised	13.5 ± 3.1	14.1 ± 2.6	0.065	9.2 ± 3.3	10.6 ± 3.5	0.001
Visuospatial memory test-revised	6.3 ± 2.0	6.4 ± 1.8	0.649	4.2 ± 2.2	5.3 ± 2.6	0.000
Trail-making test	309.1 ± 75.6	292.5 ± 81.2	0.079	385.4 ± 99.5	333.4 ± 92.6	0.000
Benton judgment of line orientation	15.8 ± 2.5	15.5 ± 2.7	0.339	10.8 ± 2.8	12.5 ± 2.5	0.000
Digit span test	16.3 ± 2.6	15.9 ± 2.9	0.231	18.8 ± 3.2	14.9 ± 3.0	0.003
Symbol-digit modalities test	17.5 ± 3.8	17.6 ± 4.5	0.845	13.7 ± 4.8	15.4 ± 4.3	0.001
VLT-R delayed recall test	3.6 ± 1.2	3.8 ± 1.5	0.236	2.8 ± 1.8	3.1 ± 1.5	0.111
VLT-R discrimination index	23.1 ± 1.2	22.8 ± 1.5	0.076	21.3 ± 2.2	21.7 ± 1.7	0.068
VMT-R delayed recall test	2.9 ± 1.0	3.0 ± 1.1	0.432	2.2 ± 1.4	2.3 ± 1.9	0.635
VMT-R discrimination index	11.0 ± 3.8	11.1 ± 2.1	0.751	9.2 ± 3.3	10.2 ± 2.5	0.002
Verbal fluency test	38.5 ± 7.9	40.3 ± 8.6	0.071	33.4 ± 9.6	35.2 ± 8.7	0.090

Abbreviations: VLT-R, verbal learning test-revised; VMT-R, visuospatial memory test-revised.