How does the prevalence of juvenile idiopathic arthritis (JIA) vary by age?

Updated: Jul 25, 2019
  • Author: David D Sherry, MD; Chief Editor: Lawrence K Jung, MD  more...
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Although JIA is defined as arthritis beginning before age 16 years, the age at onset is often much lower, with the highest frequency occurring in children aged 1-3 years. [16] This age distribution is most evident in girls with oligoarticular JIA and psoriatic arthritis.

Polyarticular RF-negative JIA has a biphasic peak of onset; the first is at a young age (1-4 y), similar to oligoarticular JIA, and the second peak is at age 6-12 years. RF-positive disease is more common in adolescents. Systemic-onset JIA is not characterized by a peak age of onset; it is spread across the childhood years. The usual age of onset of enthesitis-related arthritis is 10-12 years. [15]

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