Validity of ankylosing spondylitis and undifferentiated spondyloarthritis diagnoses in the Swedish National Patient Register

Scandinavian Journal of Rheumatology
U LindströmL Jacobsson

Abstract

Epidemiological studies of spondyloarthritis (SpA), using ICD codes from the Swedish National Patient Register (NPR), offer unique possibilities but hinge upon an understanding of the validity of the codes. The aim of this study was to validate the ICD codes for ankylosing spondylitis (AS) and undifferentiated SpA (uSpA) in the NPR against the established classification criteria [modified New York (mNY), Assessment of SpondyloArthritis international Society (ASAS), Amor, and European Spondyloarthropathy Study Group (ESSG) criteria]. All patients with an ICD-8/9/10 code of AS or uSpA in the NPR 1966-2009 at a visit to a specialist in rheumatology or internal medicine or corresponding hospitalization, alive and living in Sweden 2009, were identified (n = 20 089). Following a structured procedure to achieve geographical representativeness, 500 random patients with a diagnosis of AS or uSpA in 2007-2009 were selected. Based on a structured review of clinical records, positive predictive values (PPVs) for fulfilling the criteria sets were calculated. For those having received an ICD code for AS, the PPVs for fulfilling the mNY criteria or any set of SpA criteria were 70% and 89%, respectively. For those with an uSpA diagnosis (and n...Continue Reading

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Citations

Jan 15, 2016·Pharmacoepidemiology and Drug Safety·Maureen DubreuilTuhina Neogi
Sep 22, 2015·Scandinavian Journal of Urology·Ane Krag JakobsenL E Kristensen
Nov 1, 2016·Scandinavian Journal of Gastroenterology·Gustav L JakobssonJonas F Ludvigsson
May 6, 2016·Annals of the Rheumatic Diseases·Karin HellgrenUNKNOWN ARTIS Study Group, For the DANBIO Study Group
Sep 5, 2015·Annals of the Rheumatic Diseases·Sofia ExarchouLennart Th Jacobsson
Dec 25, 2015·Annals of the Rheumatic Diseases·Gustav L JakobssonLennart T H Jacobsson
May 10, 2017·Annals of the Rheumatic Diseases·Alexander EgebergLotus Mallbris
Jul 13, 2017·Annals of the Rheumatic Diseases·Amar OzaHyon K Choi
Jul 30, 2019·Scandinavian Journal of Rheumatology·A NygaardB Schiøttz-Christensen
Jun 1, 2020·Translational Psychiatry·Lauren M O'ReillyBrian M D'Onofrio
Aug 28, 2020·Clinical Rheumatology·Anna SödergrenLennart T H Jacobsson
Oct 25, 2020·BMC Cardiovascular Disorders·Maria FedchenkoMikael Dellborg
Dec 18, 2020·Amyotrophic Lateral Sclerosis & Frontotemporal Degeneration·Can CuiFang Fang
Jul 4, 2021·Revue D'épidémiologie Et De Santé Publique·B CastagnéUNKNOWN groupe REDSIAM

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