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Synovial fluid soluble CD23 levels in RA and reactive arthritis (ReA), a control inflammatory non-erosive arthropathy. Boxes represent the interquartile range, i.e. the middle 50% of the data, between 25th and 75th quartile. Whiskers represent the 10th and 90th quartiles, and circles represent values out of this range. Asterisks indicate a significant difference versus erosive knee−/hand+ RA: *P < 0·05; ***P < 0·001 (Mann–Whitney test).
