Table VII.

Results of neuropsychology test between the POCD and non-POCD groups (mean ± SD) at 3 months post-operation.

Items	Time	POCD (n=32)	Non-POCD (n=48)
Summation	Pre-operative	60±17	64±24
	Post-operative	36±30a,c	52±24a
Visual	Pre-operative	9.5±1.6	8.9±2.0
reproduction	Post-operative	7.1±2.4b	8.5±2.2
Associative	Pre-operative	12.1±2.0	11.6±3.5
learning	Post-operative	9.0±2.4b,c	11.5±3.4
Digit	Pre-operative	4.6±1.2	4.5±1.2
span-forward	Post-operative	4.6±1.3	4.7±1.3
Digit	Pre-operative	2.4±1.0	3.2±1.0
span-backward	Post-operative	1.9±1.5b	3.1±1.0
Digit	Pre-operative	22±9	21±7
symbol	Post-operative	21±8	20±7
Ligature	Pre-operative	60±11	56±12
	Post-operative	58±10c	54±12
Total score		3.5±1.1c	1.1±0.6

^aP<0.05

^bP<0.01, compared to the pre-operative time

^cP<0.01, compared to the non-POCD. POCD, postoperative cognitive dysfunction.