Table 1. Subjects demographics and risk factors in knee OA.

Variable	Cases (n=308)	Controls (n=404)	P
Sex			0.245
Male	166 (53.9%)	200 (49.5%)
Female	142 (46.1%)	204 (50.5%)
Age (years)	51.42 ± 6.69	51.64 ± 7.02	0.670
BMI (kg/m2)	24.40 ± 1.45	24.25 ± 1.54	0.185
ESR (mm/h)	13.41 ± 4.35	13.80 ± 4.27	0.227
CRP (mg/l)	2.58 ± 0.77	1.69± 0.44	<0.001
Kellgren–Lawrence grading
1	66 (21.5%)	–	–
2	147 (47.6%)	–	–
3	87 (28.3%)	–	–
4	8 (2.6%)	–	–