Rozendaal 2008.

Methods	Randomized controlled trial Double blinded Parallel group Single center
Participants	Outpatients with osteoarthritis of the hip Country: Netherlands N = 222 69% female 31% male Mean age = 63.4 years
Interventions	GS 1500 mg per day versus placebo Duration: 2 years
Outcomes	WOMAC pain, WOMAC stiffness, WOMAC function, VAS pain, joint space narrowing, usage of pain medication
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ Adequate