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Table 1 Profiles of JIA patients presenting at University Teaching Hospital, Lusaka, Zambia from 1994–98 & 2006–2010

From: Clinical patterns of juvenile idiopathic arthritis in Zambia

JIA subtypes Total number (%) Female: male ratio Mean age at disease onset (Years ±STD) Age range at onset (Years) Mean age at presentation (Years ±STD) Age range at presentation (Years)
Overall 78(100%) 1.2:1 8.70±5.00 1–15 11.3±5.8 2–25
Systemic JIA 11(14.1%) 1:1.2 6±4.3 2–15 8±4.00 4.5–18
Polyarticular RF̄(−) JIA 27(34.6%) 1.7:1 10.70±3.4 3–15 12.89±3.8 4–16
Polyarticular RF̄(+) JIA 9(11.5%) 9:0 11.0±4.5 3–15 16.0±7.0 4–24
Oligoarticular arthritis 25(32.0%) 1:1.1 6.6±4.3 1–14 8.1±4.7 1.6–18
Psoriatic arthritis JIA 1(1.3%) NA 13 NA 9 NA
Enthesitis related arthritis 5(6.4%) 1:4 10.9±4.8 2–15 17.8±4.2 9–28
Others (undifferentiated) 0(0%) NA NA NA NA NA
  1. NB.: JIA Juvenile Idiopathic Arthritis, STD Standard Deviation, RF (−) Rheumatoid Factor negative, RF(+) Rheumatoid Factor Positive, NA Not applicable.