OBJECTIVE: To clarify the development of juvenile idiopathic arthritis (JIA) to adult-onset autoimmune diseases in a population-based study in Taiwan. METHODS: We analyzed data of 107 433 children born between 1990 and 1997 from the National Taiwan Health Insurance Database. There were 262 JIA patients and 107 171 individuals without JIA who were selected and followed up until December 2013 to investigate their outcomes of adult-onset autoimmune diseases after reaching 16 years of age. The adjusted hazard ratios (aHRs) including 95% confidence intervals (95% CI) of adult-onset autoimmune diseases were calculated using the Cox proportional regression model among different age groups. RESULTS: person-months for rheumatoid arthritis (RA), 16.61 for systemic lupus erythematosus (SLE), 58.39 for ankylosing spondylitis (AS), and 33.26 for psoriatic diseases. The aHRs were 29.60 for any autoimmune disease, 129.52 for RA, 10.01 for SLE, 49.62 for AS, and 8.20 for psoriatic diseases. Compared with non-JIA individuals, the aHRs of adult-onset autoimmune diseases were 34.87 (95% CI: 4.85-250.62) at the onset age of 3-5 years, 12.01 (95% CI: 2.99-48.26) at the age of 6-10 years, and 45.80 (95% CI: 29.69-70.64) at the age of 11-15 years. CONCLUSION: Children with JIA were at an increased risk of developing RA, AS, psoriatic disease, and SLE in adulthood.
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