Baseline characteristics of patients at the time of TNF-α inhibitor initiation according to the reason for subsequent switching.

TNF, tumor necrosis factor; BMI, body mass index; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein; AST, aspartate aminotransferase; ALT, alanine aminotransferase; INH, isoniazid; NSAIDs, non-steroidal anti-inflammatory drugs; DMARDs, disease-modifying anti-rheumatic drugs. Continuous variables are shown as medians and interquartile range. Baseline characteristics of patients at the time of TNF-α inhibitor initiation according to the reason for subsequent switching.