Table 1.

Clinical characteristics of the patients and control subjects used in the study.

Screening set	Control	OA = 273			RA
		K/L = 2	K/L = 3	K/L = 4
Number of subjects	76	110	106	57	244
Female (%)	55	74	86	88	75
BMI, kg/m2 (mean ± SD)	29 ± 6	31 ± 5	32 ± 6	32 ± 5	27 ± 5
Age, years (mean ± SD)	63 ± 9	66 ± 8	69 ± 9	69 ± 10	55 ± 14
Verification set	Control	OA = 188			RA
		K/L = 2	K/L = 3	K/L = 4
Number of subjects	83	38	27	123	168
Female, %	59	76	78	78	74
BMI, kg/m2 (mean ± SD)	25 ± 4	31 ± 5	31 ± 4	32 ± 5	27 ± 5
Age, years (mean ± SD)	54 ± 19	67 ± 11	71 ± 7	71 ± 8	58 ± 12

BMI, indicates body mass index; K/L, Kellgren-Lawrence score and SD, standard deviation.