Table 3 Comparison of the results of the D2 attention test in patients with carotid artery stenosis before and one year after stenting (Wilcoxon test).

Variable	Before stenting			After stenting			Z	p
Variable	median	Q1-Q3		median	Q1-Q3		Z	p
WZ	354	317	412	375	301	416	1,568	0,117
B	35	15	51	27	18	51	0,137	0,891
%B	9	5	15	7	4	13	0,705	0,481
WZ-B	324	268	371	320	259	381	1,831	0,067
ZK	111	87	134	114	98	144	1,964	0,049*
GP	14	10	21	14	12	19	0,278	0,781
B1-4	10	4	14	8	3	13	0,854	0,393
B5-10	16	7	22	13	5	21	0,031	0,975
B11-14	10	4	16	9	3	16	0,041	0,967
B1	29	13	45	24	14	45	0,186	0,852
B2	3	1	6	2	1	5	0,483	0,629

*Statistically significant, WZ - working speed, B - sum of all errors, %B - the percentage of errors, WZ-B - general perceptual ability, ZK - ability to concentrate, GP – indicator of the subject’s constant or changing way of working, B1-4 - errors from the first part of the tasks (lines 1–4), B5-10- errors from the middle part of the tasks (lines 5–10), B11-14 - errors from the last part of the tasks (lines 11–14), B1 - errors of omission, B2 - number of incorrectly crossed out letters.

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