{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T05:23:24Z","timestamp":1787030604334,"version":"build-2736575974"},"reference-count":27,"publisher":"The Journal of Rheumatology","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Rheumatol"],"published-print":{"date-parts":[[2014,12]]},"abstract":"<jats:sec>\n                    <jats:title>Objective.<\/jats:title>\n                    <jats:p>To describe the trajectories of longitudinal joint disease activity in juvenile idiopathic arthritis (JIA), and to examine associations of clinical and laboratory characteristics with the identified trajectories.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods.<\/jats:title>\n                    <jats:p>A retrospective cohort study at 2 Canadian centers was performed. The longitudinal trajectories of active joint counts were described in a proof-of-concept study using a latent growth curve analysis. Baseline patient characteristics were compared across trajectory groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results.<\/jats:title>\n                    <jats:p>Data were analyzed on 659 children diagnosed with JIA between March 1980 and September 2009. The median age at diagnosis was 10.0 years (interquartile range 3.7\u201313.4) and 61% (402\/659) were female. The International League of Associations for Rheumatology (ILAR) diagnoses were as follows: oligoarthritis (36%), enthesitis-related arthritis (20%), rheumatoid factor (RF)-negative polyarthritis (13%), undifferentiated arthritis (12%), psoriatic arthritis (8%), systemic arthritis (7%), and RF-positive polyarthritis (4%). Based on the trajectories of their active joint counts, the 659 patients were each classified in 1 of 5 latent classes (which can be described as high decreasing, moderate increasing, persistent moderate, persistent low, and minimal joint activity). These latent classes were clinically and statistically distinct from the ILAR categories.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion.<\/jats:title>\n                    <jats:p>In this proof-of-concept study, in which we used an analytic methodology in a novel way, we identified 5 clinically and statistically distinct trajectories of disease course. The subsets of patients within each class were different from those described by the ILAR classification criteria. This successful application of this method supports its use in a chronic disease with a fluctuating course such as JIA. These methods should be expanded for the purposes of predictive modeling.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3899\/jrheum.130835","type":"journal-article","created":{"date-parts":[[2014,10,2]],"date-time":"2014-10-02T03:42:40Z","timestamp":1412221360000},"page":"2466-2473","source":"Crossref","is-referenced-by-count":18,"title":["Description of Active Joint Count Trajectories in Juvenile Idiopathic Arthritis"],"prefix":"10.3899","volume":"41","author":[{"given":"Roberta A.","family":"Berard","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"George","family":"Tomlinson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiuying","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kiem","family":"Oen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alan M.","family":"Rosenberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian M.","family":"Feldman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rae S.M.","family":"Yeung","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claire","family":"Bombardier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2262","published-online":{"date-parts":[[2014,10,1]]},"reference":[{"key":"2018112909334316000_41.12.2466.1","first-page":"390","article-title":"International League of Associations for Rheumatology classification of juvenile idiopathic arthritis: second revision, Edmonton, 2001","volume":"31","author":"Petty","year":"2004","journal-title":"J Rheumatol"},{"key":"2018112909334316000_41.12.2466.2","doi-asserted-by":"publisher","DOI":"10.1093\/rheumatology\/keh620"},{"key":"2018112909334316000_41.12.2466.3","doi-asserted-by":"publisher","DOI":"10.1093\/rheumatology\/keh621"},{"key":"2018112909334316000_41.12.2466.4","doi-asserted-by":"publisher","DOI":"10.1136\/ard.2010.133033"},{"key":"2018112909334316000_41.12.2466.5","first-page":"1989","article-title":"Disease course and outcome of juvenile rheumatoid arthritis in a multicenter cohort","volume":"29","author":"Oen","year":"2002","journal-title":"J Rheumatol"},{"key":"2018112909334316000_41.12.2466.6","doi-asserted-by":"publisher","DOI":"10.1002\/art.10444"},{"key":"2018112909334316000_41.12.2466.7","first-page":"394","article-title":"Health status of patients with juvenile rheumatoid arthritis at 1 and 5 years after diagnosis","volume":"30","author":"Bowyer","year":"2003","journal-title":"J Rheumatol"},{"key":"2018112909334316000_41.12.2466.8","first-page":"952","article-title":"Long-term health outcomes and quality of life in American and Italian inception cohorts of patients with juvenile rheumatoid arthritis. 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