Fig. 1

Data completeness for variables collected in axSpA (upper panel) and PsA (lower panel) overall and stratified by time-period for initiation of a b/tsDMARD treatment course, b/tsDMARD history and registry. Legend: Unless otherwise stated, we used secondary pseudonymized baseline data from initiation of the first biologic (b) or targeted synthetic (ts) disease-modifying anti-rheumatic drug (DMARD) treatment on patients with a clinical diagnosis of axial spondyloarthritis (axSpA) and psoriatic arthritis (PsA), 18 years or older, followed in one of the participating registries since the start of their first b/tsDMARD between 2000 and 2021. Sweden has provided data on Secukinumab-treated patients only. ASAS, Assessment of Spondyloarthritis International Society; CASPAR, Classification Criteria for Psoriatic Arthritis; MASES, Maastricht ankylosing spondylitis enthesitis index; PASI, Psoriasis Area and Severity Index; NAPSI, Nail Psoriasis Severity Index; BASMI, Bath Ankylosing Spondylitis Metrology Index; cs, concomitant synthetic; NSAID, non-steroidal anti-inflammatory drug; PROMs, patient-reported outcome measures; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Functional Index; HAQ, Health Assessment Questionnaire; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; HLA-B27, Human Leukocyte Antigen subtypes B*2701-2759; EMMs, extra-musculoskeletal manifestations. *Baseline data on patients who initiated a TNFi between January 1, 2009 and December 31, 2018 (alcohol); **baseline data on patients who initiated a new b/tsDMARD from January 1, 2015, and May 31, 2022 (prednisolone); ***baseline data on patients initiating a later line b/tsDMARD (1 prior or ≥2 prior)