Table 1.

Baseline data (x̅ ± s)/[n (%)]

Data		Observation group (n=40)	Control group (n=39)	t/X2	P
Gender	Male	23 (57.50)	21 (53.85)	0.107	0.744
	Female	17 (42.50)	18 (46.15)
Age (year)		48.95±16.37	50.34±15.75	0.384	0.702
Duration of disease (year)		0.82±0.39	0.86±0.42	0.439	0.662
Body mass (kg)		61.68±7.91	63.45±8.42	0.963	0.338
BMI (kg/m2)		23.42±1.77	24.18±1.81	1.887	0.063
Injury side	Left knee	21 (52.50)	23 (58.97)	0.335	0.562
	Right knee	19 (47.50)	16 (41.03)