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      Trends in the prevalence and incidence of ankylosing spondylitis in South Korea, 2010–2015 and estimated differences according to income status

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          Abstract

          The aim of this study is to determine the prevalence and incidence of ankylosing spondylitis (AS) in South Korea, 2010–2015. This study was conducted using the Health Insurance Review Agency (HIRA) database, which includes information on every patient diagnosed with AS. The incidence and prevalence of AS were evaluated by age, sex, and income status. The prevalence increased linearly by 7.7% annually, i.e., 31.62 in 2010 to 52.30 in 2015 (per 100,000 persons). During the study period, the incidence was 6.34 per 100,000 person-years. The prevalence peaked for both men and women in the age range 30–39 years. Incidence peaked for men in the age range 20–29 years, but peaked for women between ages 70 and 89. AS was 3.6 times more prevalent in men than in women, and the incidence in men was 2.1 times greater than in women. With respect to income status, the prevalence and incidence of AS were 3 times greater and 5 times greater, respectively, in medical aid recipients compared to individuals with other income levels. The trend of increasing AS prevalence and the observation that 14.3% of all patients newly diagnosed with AS are medical aid recipients have significant implications for healthcare planning.

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          Ankylosing spondylitis and HL-A 27.

          Timothy Brewerton, Tharappel James, M. Caffrey … (1973)
          Article 0 comments Cited 77 times – based on 0 reviews     Review now
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            Spondyloarthropathies in Japan: nationwide questionnaire survey performed by the Japan Ankylosing Spondylitis Society.

            S Hukuda, N Matsui, H. Makino … (2001)
            The Japan Ankylosing Spondylitis Society conducted a nationwide questionnaire survey of spondyloarthropathies (SpA) in 1990 and 1997, (1) to estimate the prevalence and incidence, and (2) to validate the criteria of Amor and the European Spondylarthropathy Study Group (ESSG) in Japan. Japan was divided into 9 districts, to each of which a survey supervisor was assigned. According to unified criteria, each supervisor selected all the clinics and hospitals with potential for SpA patients in the district. The study population consisted of all patients with SpA seen at these institutes during a 5 year period (1985-89) for the 1st survey and a 7 year period (1990-96) for the 2nd survey. The 1st survey recruited 426 and the 2nd survey 638 cases, 74 of which were registered in both studies. The total number of patients with SpA identified 1985-96 was 990 (760 men, 227 women). They consisted of patients with ankylosing spondylitis (68.3%), psoriatic arthritis (12.7%), reactive arthritis (4.0%), undifferentiated SpA (5.4%), inflammatory bowel disease (2.2%), pustulosis palmaris et plantaris (4.7%), and others (polyenthesitis, etc.) (0.8%). The maximum onset number per year was 49. With the assumption that at least one-tenth of the Japanese population with SpA was recruited, incidence and prevalence were estimated not to exceed 0.48/100,000 and 9.5/100,000 person-years, respectively. The sensitivity was 84.0% for Amor criteria and 84.6 for ESSG criteria. The incidence and prevalence of SpA in Japanese were estimated to be less than 1/10 and 1/200, respectively, of those among Caucasians. The adaptability of the Amor and ESSG criteria was validated for the Japanese population.
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              Incidence and prevalence of ankylosing spondylitis in Northern Norway.

              Gunnstein Bakland, J. Gran, H Nossent (2005)
              To determine the incidence and prevalence of ankylosing spondylitis (AS) over a prolonged period in the 2 northernmost counties of Norway, where HLA-B27 has a high prevalence in the population. We conducted a cohort study of all patients registered with a diagnosis of AS between 1960 and 1993 at the University Hospital of Northern Norway, which is the sole rheumatology department serving these counties. We registered demographics, year of disease onset (clinical disease), and year of diagnosis (radiograph confirmation) for all patients. The date of onset of clinical disease in patients with AS was used in the calculation of incidence rates. Annual incidence and point/period prevalence rates were expressed per 100,000 adults. Primary AS was defined as AS in the absence of psoriasis or inflammatory bowel disease (IBD). A total of 534 patients (75.1% male, mean age at clinical diagnosis 24.2 years, 93.0% HLA-B27 positive) had a confirmed diagnosis of AS (by the modified New York criteria). Median time from disease onset to radiologic confirmation was 8.0 years. Annual incidence of primary AS (n = 417) was 7.26, while estimated point prevalence rose from 0.036% in 1970 to 0.10% in 1980 and to 0.21% in 1990 with a period prevalence of 0.26%. AS was secondary to psoriasis or IBD in 117 patients (18.1%), with a diagnostic delay similar to that in primary AS. Annual incidence (14.1) and period prevalence in 1982-1993 (0.41%) were significantly higher in the town of Tromsø than in the surrounding rural region (5.21 and 0.22%, respectively). Mortality in patients with AS was low. The incidence of AS was relatively stable in the northern part of Norway over a 34-year period. Incidence and prevalence are higher than reported in similar studies from Finland and Minnesota, possibly due to a higher population prevalence of HLA-B27.
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                Author and article information

                Contributors
                Jae-Young Hong: osspine@korea.ac.kr
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 16 May 2018
                Publication date PMC-release: 16 May 2018
                Publication date Collection: 2018
                Volume: 8
                Electronic Location Identifier: 7694
                Affiliations
                [1 ]ISNI 0000 0004 0474 0479, GRID grid.411134.2, Department of Orthopedics, , Korea University Ansan Hospital, ; Ansan-si, South Korea
                [2 ]ISNI 0000 0004 0647 3212, GRID grid.412145.7, Department of Orthopedics, , Hanyang University Guri Hospital, ; Guri-si, South Korea
                [3 ]ISNI 0000 0004 0470 4224, GRID grid.411947.e, Department of Biostatistics, Biomedicine & Health Sciences, , Catholic University, ; Seoul, South Korea
                [4 ]ISNI 0000 0004 0474 0479, GRID grid.411134.2, Scoliosis Research Institute, Department of Orthopedics, , Korea University Guro Hospital, ; Seoul, South Korea
                Article
                Publisher ID: 25933
                DOI: 10.1038/s41598-018-25933-4
                PMC ID: 5955990
                PubMed ID: 29769560
                SO-VID: e5956b43-63ea-41e2-ba2b-2881c6942b24
                Copyright © © The Author(s) 2018
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 13 December 2017
                Date accepted : 30 April 2018
                Categories
                Subject: Article
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                issue-copyright-statement © The Author(s) 2018

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