Additional file 1 of A cluster analysis of patients with axial spondyloarthritis using tumour necrosis factor alpha inhibitors based on clinical characteristics

Additional file 1: Supplementary Methods. Table S1: Clinical variables excluded in adjusting multiple comparisons. Table S2: Number of users of each TNFi. Table S3: Reasons for discontinuation of tumour necrosis factor alpha inhibitors and duration until discontinuation in two groups that were excluded from the drug survival analysis. Table S4: Comparison of the divided clusters with radiographic classification (radiographic axial SpA and non-radiographic axial SpA). Table S5: Comparison of the divided clusters with the division of non-radiographic axial SpA into radiographic and clinical arms according to the Assessment of SpondyloArthritis International Society criteria for axial SpA. Table S6: Comparison of the divided clusters with grouping according to HLA-B27 positivity.