Baseline characteristics of the total AS study population and stratified by the presence or absence of syndesmophytes at baseline.

Values are presented as number of patients (%), mean ± SD, or median (IQR).AS: ankylosing spondylitis; HLA: human leukocyte antigen; BMI: body mass index; NSAID: non-steroidal anti-inflammatory drug; ASAS: Assessment of SpondyloArthritis international Society; BASDAI: Bath AS Disease Activity Index; ASDAS: AS Disease Activity Score; GDA: global disease activity; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; mSASSS: modified Stoke AS Spine Score.Baseline characteristics of the total AS study population and stratified by the presence or absence of syndesmophytes at baseline.