Table 2. Patient demographics and risk factors in knee osteoarthritis.

Variable	Cases (n=215)	Controls (n=215)	P
Age (years)
≤50	104	99	0.593
>50	111	116
Sex
Female	130(60.5%)	120(55.8%)	0.328
Male	85(39.5%)	95(44.2%)
Body mass index	26.2 ± 3.4	24.6 ± 3.7	<0.001
Kellgren–Lawrence grading
0	–	137(63.7%)
1	–	78(36.3%)
2	54(25.1%)	–
3	105(48.8%)	–
4	56(26.0%)	–