Change in different classes of chronic back pain suspicious of axial spondyloarthritis: a latent transition analysis of the SPACE cohort

Objectives To follow up four previously identified classes ‘pure axial spondyloarthritis’ (axSpA) (‘axial’), ‘axSpA with peripheral signs’ (‘inflammatory back pain+peripheral’), ‘axSpA at risk’ and ‘no spondyloarthritis’ (‘no SpA’). They reflect the expert-opinion-free construct or ‘Gestalt’ of chro...

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