TABLE 1.

Patient Characteristics at Baseline^a

	Surgery (n = 85)	Nonsurgery (n = 61)	P
Age, mean ± SD, y	55 ± 5	54 ± 6	.443b
Sex, male/female, n	43/42	39/22	.109c
Duration of knee pain, median (IQR), mo	7 (8)	7 (8)	.839d
OA severity (Kellgren-Lawrence grade)			.369e
0	30 (38)	15 (25)
1	18 (23)	19 (32)
2	31 (39)	25 (42)
3	1 (1)	1 (2)
Sudden onset of pain	47 (56)	32 (55)	.927c
Mechanical symptoms	58 (69)	32 (54)	.071c
Age <55 y	42 (49)	32 (53)	.716c
Moderate to high physical activity level (PAS 4-6)	27 (33)	19 (33)	.960c

^aValues are shown as n (%) unless otherwise indicated. IQR, interquartile range; OA, osteoarthritis; PAS, Physical Activity Scale.

^bIndependent-samples t test.

^cPearson chi-square test.

^dMann-Whitney U test.

^eFisher exact test.