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Performance of the Expanded Cardiovascular Risk Prediction Score for Rheumatoid Arthritis in a geographically distant National Register-based cohort: an external validation
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Rheumatology. Department of Medicine Solna, Clinical Epidemiology Section, Karolinska Institutet, Stockholm, Sweden.
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2018 (English)In: RMD Open, E-ISSN 2056-5933, Vol. 4, no 2, article id UNSP e000771Article in journal (Refereed) Published
Abstract [en]

Background Cardiovascular (CV) risk stratification for patients with rheumatoid arthritis (RA) should facilitate evidence-based management. Prior work has derived an internally validated a CV risk score, the Expanded Cardiovascular Risk Prediction Score for Rheumatoid Arthritis (ERS-RA), using US data. The aim of this study was to perform an external validation among unselected patients with RA from Europe. Methods Three large, partially overlapping, cohorts of patients with RA from the Swedish Rheumatology Quality register were identified for external validation, two with information on smoking and two with close to 10 years of median follow-up. The 10-year rate of first CV events was assessed using the Kaplan-Meier method. The performance of ERS-RA was assessed using C-index and comparisons of observed versus predicted risks. Results The C-index for ERS-RA varied across the three RA cohorts, from 0.75 to 0.78. Predicted risks corresponded well to observed risks among individuals with <= 10 % observed 10-year CV risk, but underestimated risk in individuals with a higher observed risk. In the absence of data on smoking, ERS-RA underestimated the CV risk by 3.3%, whereas in the cohorts including data on smoking, the calibration was within 1% (0.06% and 0.7%). In the clinically relevant risk intervals (<5%, 5.0%-<7.5%, 7.5%-<10%), ERS-RA performed well. Conclusions In an unselected Swedish population with RA, ERS-RA performed well, although the 10-year CV risk was underestimated in high-risk groups and in the absence of data on smoking. ERS-RA could be considered as a risk stratification tool for targeted preventive interventions in clinical rheumatology practice.

Place, publisher, year, edition, pages
BMJ Publishing Group Ltd, 2018. Vol. 4, no 2, article id UNSP e000771
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Rheumatology and Autoimmunity
Identifiers
URN: urn:nbn:se:umu:diva-156014DOI: 10.1136/rmdopen-2018-000771ISI: 000455537200028PubMedID: 30622736OAI: oai:DiVA.org:umu-156014DiVA, id: diva2:1284662
Funder
Västerbotten County CouncilSwedish Rheumatism AssociationNIH (National Institute of Health), R01 HL127118Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-01Bibliographically approved

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Ljung, Lotta

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