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Table 1 Characteristics of juvenile idiopathic arthritis (JIA) among children in Oman (N = 107)

From: Epidemiology of juvenile idiopathic arthritis in Oman

JIA subtype n (%) Age at onset, years ± SD F/M ratio ANA+ (%) Mean ESR, mm/h
Oligo JIA 34 (31.8 %) 5.3 ± 3.8 3.3/1 32.3 31.3
Poly RF –ve 42 (39.2 %) 8.0 ± 3.5 3.2/1 21.4 43.8
Poly RF + ve 8 (7.5 %) 8.8 ± 3.1 8/1 50 61.8
Systemic 19 (17.8 %) 5.0 ± 3.3 1/1 0 80.6
ERA 3 (2.8 %) 12.0 ± 2.6 0/3 0 62.6
Psoriatic 1 (0.9 %) 11 0/1 0 60
Others 0 (0 %) na na na na
  1. SD standard deviation, F/M female/male, ANA anti-nuclear antibodies, ESR erythrocyte sedimentation rate, Oligo oligoarticular, Poly RF polyarticular rheumatoid factor, ERA enthesitis-related arthritis, na not available