%0 Journal Article
%T Self-reported Diagnosis of Rheumatoid Arthritis or Ankylosing Spondylitis Has Low Accuracy: Data from the Nord-Trondelag Health Study
%A Videm, V.
%A Thomas, R.
%A Brown, M. A.
%A Hoff, M.
%J The Journal of Rheumatology
%D 2017
%V 44
%N 8
%@ 0315-162X
%G English
%F Videm_etal2017
%O PMID:28412703
%O exported from refbase (http://vev.medisin.ntnu.no/refbase/show.php?record=2001), last updated on Fri, 02 Feb 2018 16:16:29 +0100
%X OBJECTIVE: Self-reported diagnoses of inflammatory arthritis are not accurate. The primary study aim was to ascertain self-reported diagnoses of rheumatoid arthritis (RA) and ankylosing spondylitis (AS) in the Norwegian population-based Nord-Trondelag Health Study (HUNT) using hospital case files. The secondary aim was to provide updated estimates of the prevalence and incidence of RA and AS. METHODS: All inhabitants >/= 20 years old from the county of Nord-Trondelag were invited. Data from 70,805 unique participants from HUNT2 (1995-1997) and HUNT3 (2006-2008) were included. For participants who self-reported RA or AS, case files from all 3 hospitals in the catchment area were evaluated using standardized diagnostic criteria. RESULTS: Of 2703 self-reported cases of RA, 19.1% were verified in hospital files. Of 1064 self-reported cases of AS, 15.8% were verified. Of 259 cases self-reporting both RA and AS, 8.1% had RA and 5.4% had AS. Overall, a self-report of 1 or both diagnoses could not be verified in 82.1%, including 22.8% with insufficient information or no case file. The prevalence of RA was 768 (95% CI 705-835) per 100,000. The incidence of RA from HUNT2 to HUNT3 was 0.48 (0.41-0.56) per 1000 per year. The prevalence of AS was 264 (228-305) per 100,000. The incidence of AS from HUNT2 to HUNT3 was 0.19 (0.15-0.24) per 1000 per year. CONCLUSION: Self-reported diagnoses of RA and AS are often false-positive. The prevalence and incidence of RA were comparable to reports from similar populations. The incidence of AS was higher than previously reported in a mixed population from Norway.
%K Ankylosing Spondylitis
%K Epidemiology
%K Rheumatoid Arthritis
%R 10.3899/jrheum.161396
%U http://www.ncbi.nlm.nih.gov/pubmed/28412703
%U https://doi.org/10.3899/jrheum.161396
%P 1134-1141