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Efficacy endpoints of NSAIDs in ankylosing spondylitis. (A) MDs among NSAIDs and the placebo for Bath Ankylosing Spondylitis Functional Index. (B) ORs among NSAIDs and the placebo for assessment of the Ankylosing Spondylitis 20% response. A negative MD value or an OR of >1.0 indicated a benefit from therapy. MD, mean difference; NSAIDs, non-steroidal anti-inflammatory drugs; OR, odds ratio.
