Adjusted mean changes from baseline. Adjusted mean changes from baseline are shown for two (<4 and ≥4 years) and four groups of symptom duration (<4, 2 to 4, 4 to 8 and ≥8 years). BASDAI, Bath ankylosing spondylitis disease activity index; BASFI, Bath ankylosing spondylitis functional index; ASDAS, ankylosing spondylitis disease activity score; CRP, C-reactive protein and SIJ, sacroiliac joint.
Weiß et al. Arthritis Research & Therapy 2014 16:R35 doi:10.1186/ar4464