Table 2.

The obtained synovial fluid from OA patients and non-OA patients

Patients No	Gender	Age	OA grade	Samples	IDO1 average level
33	Female*	> 67±13	3-4	SF	25.23±6.5 IU/mL
19	Male	> 65±11	3/4	SF	22.75±8.2 IU/mL
5	Male	> 42±9	Negative	SF	2.26±1.4 IU/ml

OA: Osteoarthritis, SF: synovial fluid;

^* P<0.05.