CRP and ankylosing spondylitis: At 3 years with: Taking NSAIDs between visits [OR= 5.42; CI 95% (1.40–20.97)] (p-value:0,014) and a high average ankylosing spondylitis disease activity score with C-reactive protein (ASDAS CRP) on the day of the visit [OR= 2.84; CI 95% (1.43–5.63)] (p-value:0,003).