Table 1. Descriptions of personal and clinical characteristics of patients according to the subgroups and results of statistical tests.

	Subgroup
Variable	1		2		3		4		p
	n	%	n	%	n	%	n	%
K&L Right									0.149*
0	0	0.0	0	0.0	2	4.1	0	0.0
1	4	8.2	1	2.0	6	12.2	1	2.3
2	20	40.8	17	34.0	12	24.5	13	29.5
3	15	30.6	21	42.0	19	38.8	14	31.8
4	10	20.4	11	22.0	10	20.4	16	36.4
K&L Left									0.361*
0	0	0.0	0	0.0	0	0.0	3	6.4
1	5	10.2	3	6.1	5	10.2	1	2.1
2	21	42.9	14	28.6	14	28.6	15	31.9
3	16	32.7	25	51.0	16	32.7	20	42.6
4	7	14.3	7	14.3	14	28.6	8	17.0
Gender									0.893
Male	13	26.5	10	20.0	12	24.5	11	23.4
Female	36	73.5	40	80.0	37	75.5	36	76.6
Race									0.616#
White	27	56.2	31	63.3	32	66.7	33	70.2
Mulatto/Mestizo	12	25.0	11	22.4	10	20.8	8	17.0
Black	9	18.8	5	10.2	5	10.4	4	8.5
Asian	0	0.0	2	4.1	1	2.1	2	4.3
Knee									0.745
Right	39	79.6	43	86.0	41	83.7	41	87.2
Left	10	20.4	7	14.0	8	16.3	6	12.8
Bilateral									0.866
No	15	30.6	14	28.0	17	34.7	13	27.7
Yes	34	69.4	36	72.0	32	65.3	34	72.3

Chi-sqare test; # Likelyhood ratio test; * Kruskal-Wallis's test; K&L: Kellgren and Lawrence