Juvenile Idiopathic Arthritis (JIA)

Hala Etayari
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JIA - Epidemiology
The true prevalence of JIA is not known, but approximately 1 in 1000 children worldwide are affected. The reported incidence and prevalence varies considerably in different regions. This variation may reflect differences in ethnicity, environmental factors or immunogenic succeptibility, or may result from underreporting in some countries. (3,5)
Overall, more females than males are affected by JIA; however, the sex distribution varies by disease subtype, with a striking female predominance in the oligoarticular and polyarticular onset subtypes, an even distribution of sexes in the systemic onset subtype, and a male predominance in the enthesitis related arthritis subtype. (5)
Certain subtypes have an age specific peek incidence; however, it is unusual for JIA to be manifested before 6months of age. (2,3)
Different proportions of JIA subtypes were reported from different countries. In USA and Europe the oligoarticular subtype is the commonest, while in India, South Africa and Zambia ERA and seronegative oligoarticular JIA reported more. (3)


References
Juvenile Idiopathic Arthritis (JIA) Juvenile Idiopathic Arthritis (JIA) 05/11/2016
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