CRP and ankylosing spondylitis: BMI body mass index, CRP C-reactive protein, BASDAI bath ankylosing spondylitis disease activity index (range, 1–10), MASES the maastricht ankylosing spondylitis enthesitis score (range, 1–13), BASMI bath ankylosing spondylitis metrology index, BASFI bath ankylosing spondylitis functional Index (range, 0–10), BAS-G bath ankylosing spondylitis patient global score (range, 0–10), HAQ health assessment questionnaire (range, 0–3), NSAIDs non-steroidal anti-inflammatory drugs), DMARDs disease-modifying anti-rheumatic drugs