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ORs and 95% CIs for combinations of arthritis-related diseases in first-degree relatives associated to proband’s rheumatoid arthritis (RA) ascertained through the National Patient Register, by serology. Affected first-degree relative (FDR) should be read as having an FDR affected by the condition on the axis. Sparse data made it impossible to estimate the risk for juvenile idiopathic arthritis (JIA) associated with one FDR with JIA and another with seronegative RA.
