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All patients received followup care for at least 3 months; patients whose symptoms were prolonged received followup care for a minimum of 2 years. The incidence per 100,000 children under 16 years of age was as follows: 108.5 for all cases of arthritis, 6.7 for septic arthritis, 5.4 for enteropathic arthritis, 51.9 for transient synovitis of the hip, 18.9 for prolonged arthritis (duration &gt;3 months), and 25.8 for acute transient arthritis. The incidence of juvenile rheumatoid arthritis was 19.6. Oligoarticular disease was prevalent (76%) among the juvenile rheumatoid arthritis patients.<\/jats:p>","DOI":"10.1002\/art.1780291008","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T21:17:48Z","timestamp":1171487868000},"page":"1232-1238","source":"Crossref","is-referenced-by-count":78,"title":["Incidence of arthritis in urban finnish children: A prospective study"],"prefix":"10.1002","volume":"29","author":[{"given":"Ilkka","family":"Kunnamo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pentti","family":"Kallio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pirkko","family":"Pelkonen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,11,29]]},"reference":[{"key":"e_1_2_1_2_2","first-page":"1","article-title":"A prognostic study of juvenile rheumatoid arthritis","volume":"166","author":"Laaksonen AL","year":"1966","journal-title":"Acta Paediatr Scand"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/art.1780180309"},{"key":"e_1_2_1_4_2","first-page":"162","article-title":"Juvenile arthritis in various racial groups in British Columbia","volume":"20","author":"Hill R","year":"1977","journal-title":"Arthritis Rheum (suppl)"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/art.1780261006"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.2105\/AJPH.73.10.1202"},{"key":"e_1_2_1_7_2","first-page":"506","article-title":"Rheumatic fever and its sequels in children","volume":"7","author":"Leirisalo M","year":"1980","journal-title":"J Rheumatol"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1177\/000992288302201202"},{"key":"e_1_2_1_9_2","doi-asserted-by":"publisher","DOI":"10.1177\/000992288001900304"},{"key":"e_1_2_1_10_2","first-page":"195","article-title":"Current proposed revision of JRA criteria","volume":"20","author":"Brewer EJ","year":"1977","journal-title":"Arthritis Rheum (suppl)"},{"key":"e_1_2_1_11_2","first-page":"149","article-title":"Evaluation of six tests for circulating IgG complexes with special reference to IgM rheumatoid factors: analysis of systemic lupus erythematosus and rheumatoid arthritis series","volume":"46","author":"Wager O","year":"1981","journal-title":"Clin Exp Immunol"},{"key":"e_1_2_1_12_2","doi-asserted-by":"publisher","DOI":"10.1136\/ard.31.1.34"},{"key":"e_1_2_1_13_2","doi-asserted-by":"publisher","DOI":"10.1136\/ard.44.6.399"},{"key":"e_1_2_1_14_2","doi-asserted-by":"publisher","DOI":"10.3109\/03009748209098189"},{"key":"e_1_2_1_15_2","unstructured":"PelkonenP:Rheumatic children's need of local health services Proceedings of the XXI Northern Pediatric Congress Oulu Finland June1985 p82"},{"key":"e_1_2_1_16_2","unstructured":"LanttoR von WendtL:Juvenile rheumatoid arthritis in northern Finland (abstract) Proceedings of the Second International Symposium on Inflammatory Connective Tissue Diseases in Childhood and Adolescence Prague September1985 p41"},{"key":"e_1_2_1_17_2","first-page":"174","volume-title":"Juvenile rheumatoid arthritis, Textbook of Pediatric Rheumatology","author":"Cassidy JT","year":"1982"},{"key":"e_1_2_1_18_2","doi-asserted-by":"publisher","DOI":"10.3109\/inf.1983.15.issue-1.12"},{"key":"e_1_2_1_19_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.32.4.664"},{"key":"e_1_2_1_20_2","doi-asserted-by":"publisher","DOI":"10.3109\/03009747809095652"},{"key":"e_1_2_1_21_2","first-page":"190","article-title":"Vergleich der Aussagekraft von vier immunologischen Nachweismethoden (AST, ADNase B, AHy, ANADase) bei A\u2010Streptokokken Infektionen und ihre Bedeutung fur die Routinediagnostik","volume":"4","author":"Tiesler A","year":"1976","journal-title":"Immun Infekt"},{"key":"e_1_2_1_22_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF01641193"},{"key":"e_1_2_1_23_2","doi-asserted-by":"publisher","DOI":"10.1002\/jmv.1890130204"},{"key":"e_1_2_1_24_2","first-page":"1637","volume-title":"Kawasaki disease, Textbook of Pediatric Infectious Diseases","author":"Morens DM","year":"1981"}],"container-title":["Arthritis &amp; 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