Table 1.

Distributions of select variables in OA cases and controls

Variables	Case	Control	P
	n = 278 (%)	n = 289 (%)
Age, year (mean ± SD)	62.00 ± 10.55	61.13 ± 10.92	0.34
Gender			0.87
Male	82(29.5)	87(30.1)
Female	196(70.5)	202(69.9)
BMI	24.97 ± 3.26	23.84 ± 2.96	< 0.01
< 25	150(54.0)	189(66.5)	< 0.01
≥ 25	128(46.0)	95(33.5)
KL classification
1–2	135
3–4	143

Bold font presents P < 0.05