Table 6.

Friedman test results regarding the change in the Wee Functional Independence Measure cognitive scores of the patients before and after the operation

	n	Mean	SD	Mean rank	χ 2	df	P value
Pre-test	6	5.50	0.55	1.67	28.255	5	0.000
Post-test 1 wk	6	5.67	0.82	1.83
Post-test 1 mo	6	7.17	1.60	2.75
Post-test 2 mo	6	8.33	2.25	3.83
Post-test 4 mo	6	10.17	3.06	4.92
Post-test 12 mo	6	13.00	2.83	6.00

SD: Standard deviation.