Qiu 1998.

Methods	Randomized controlled trial Double blinded Multicenter Parallel group
Participants	Outpatients with osteoarthritis of the knee Country: China N = 178 Mean age: 56.4 years Female: 79% Male: 21%
Interventions	GS 500 mg PO TID versus ibuprofen 400 mg PO TID Duration: 4 weeks of treatment and 2 weeks of follow up
Outcomes	Knee pain (at rest, movement, tenderness) 0 to 3 scale Knee swelling 0 to 3 scale Global investigator derived Safety
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate