. 2021 Jul 6;9(19):5102–5111. doi: 10.12998/wjcc.v9.i19.5102

Table 3.

Visual analogue scale scores at walking time of the two groups before and after treatment

		VAS score, mean ± SD
	n	Before treatment	1^st mo after treatment	3^rd mo after treatment	6^th mo after treatment	12^th mo after treatment	24^th mo after treatment
Group A	98	4.06 ± 1.55	1.73 ± 1.63	1.31 ± 1.44	1.04 ± 1.41	0.94 ± 1.29	0.94 ± 1.26
Group B	80	4.08 ± 1.47	2.45 ± 1.58	1.63 ± 1.39	1.35 ± 1.41	1.15 ± 1.30	1.10 ± 1.27
t value		-0.060	-2.946	-1.493	-1.459	-1.081	-0.847
t′ value		-	-	-	-	-	-
P value		0.952	0.004	0.137	0.146	0.281	0.398

Statistical difference between the two groups was tested by t test or t′ test. The comparisons between visual analogue scale (VAS) scores at walking time before treatment and VAS scores at walking time at 1, 3, 6, 12, and 24 mo after treatment were performed by analysis of variance. Further pairwise comparisons of multiple data were conducted by the S-N-K method (q test) when variance was homogeneous, or Games-Howell method when variances was not homogeneous. Statistical significance was set at P < 0.05. n: Number of patients of the two groups; SD: Standard deviation; VAS: Visual analogue scale; Group A: Arthroscopic debridement group; Group B: Conservative treatment group.