Declining Incidence of Systemic Lupus Erythematosus in Norway 1999–2017: Data From a Population Cohort Identified by International Classification of Diseases, 10th Revision Code and Verified by Classification

Objective The goal of this study was to provide complete, robust data on annual systemic lupus erythematosus (SLE) incidence rates over nearly two decades from the Southeast Norway area (2.9 million inhabitants) and assess accuracy of SLE‐specific International Classification of Diseases (ICD) codes...

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Published in:Arthritis & rheumatology (Hoboken, N.J.) N.J.), 2024-05, Vol.76 (5), p.715-725
Main Authors: Haukeland, Hilde, Moe, Sigrid R., Brunborg, Cathrine, Botea, Antonela, Damjanic, Nenad, Wivestad, Gro Å., Øvreås, Heidi K., Bøe, Thea B., Orre, Anniken, Garen, Torhild, Molberg, Øyvind, Lerang, Karoline
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Autoimmune diseases
Charts
Child
Chronic conditions
Classification
Cohort Studies
Diagnosis
Endocrine therapy
Environmental factors
Female
Females
Health problems
Humans
Incidence
International Classification of Diseases
Lupus
Lupus Erythematosus, Systemic - epidemiology
Male
Menopause
Middle Aged
Norway - epidemiology
Revisions
Systemic lupus erythematosus
Young Adult
Young adults
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Summary:Objective The goal of this study was to provide complete, robust data on annual systemic lupus erythematosus (SLE) incidence rates over nearly two decades from the Southeast Norway area (2.9 million inhabitants) and assess accuracy of SLE‐specific International Classification of Diseases (ICD) codes for SLE diagnosis. Methods From administrative databases, we identified all cases International Statistical Classification of Diseases and Related Health Problems, Tenth Revision (ICD‐10) coded as SLE during 1999 through 2017 in Southeast Norway. We manually reviewed the chart of every case ICD‐10 coded as SLE to either confirm or reject SLE diagnosis. Using SLE classification criteria, we classified all cases with confirmed SLE. We estimated annual incidence rates of classified SLE, and subsets, defined by age at diagnosis, sex, and parental country of birth. The chi‐square test was applied for linear time‐trend analyses of incidence. Results Among the 3,488 cases ICD‐10 coded as SLE, chart reviews confirmed SLE diagnosis in 1,558 (45%), of which 797 had new‐onset disease during 1999 through 2017. Annual SLE incidence rates fell during 1999 to 2017. The fall was most pronounced in female persons 50 to 59 years old at diagnosis, in whom incidence fell from 3.4 to 1.1 per 100,000 persons (P trend
ISSN:2326-5191
2326-5205
DOI:10.1002/art.42775