A population-based register study of the association between schizophrenia and rheumatoid arthritis
Abstract
The authors investigated the association between schizophrenia and rheumatoid arthritis. The design is a population-based case-control and follow-up study. The cases were 20495 patients admitted for schizophrenia and registered in the Danish Psychiatric Case Register. A total of 204912 persons matched on age and gender and chosen from the general population served as controls. Admissions for rheumatoid arthritis and other non-autoimmune, musculoskeletal disorders were checked in the Danish National Patient Register. Odds ratios and relative risks were estimated by the Mantel-Haenszel estimator and Poisson regression. The same analyses were carried out for 10242 patients with bipolar affective disorder and 102420 controls for comparison. Individuals with schizophrenia had a reduced risk for being admitted with rheumatoid arthritis [odds ratio 0.44 (CI 0.24-0.81)] in the case-control study. A similar result was found in the follow-up study, but the incidence of the degenerative disorders in the musculoskeletal system was equally significantly lower in both studies. The incidence of rheumatoid arthritis among the bipolar patients was the same as in the control population. The negative association between schizophrenia and rheumatoid arthritis may thus be the result of ascertainment bias and selection due to under reporting and treatment of the medical illness. Clinicians are reminded of the difficulties in detecting medical illness among individuals with schizophrenia.
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Another Danish study found individuals with schizophrenia had a highly reduced risk for being admitted to hospital with rheumatoid arthritis [odds ratio 0.44 (CI 0.24-0.81)].
“and another Danish study also found that individuals with schizophrenia had a highly reduced risk for being admitted to a hospital with rheumatoid arthritis [odds ratio 0.44 (CI 0.24-0.81)].”
From Excess early mortality in schizophrenia. (2014) · cites this paper as Mors et al. 1999
The association between schizophrenia and reduced rheumatoid arthritis could be explained by reduced tendency of patients with schizophrenia to report musculoskeletal pain.
“The authors concluded that the association could be explained by the reduced tendency of patients with schizophrenia to report musculoskeletal pain (Mors et al. 1999).”
From Excess early mortality in schizophrenia. (2014) · cites this paper as Mors et al. 1999
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Alexopoulos, G. S. (2005) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615377671.lg08
Chapter 3. Linking Fetal Experience to Adult Disease: Examples From Schizophrenia
Opler, M. G. A., Bresnahan, M. A., Smith, G. D., & Susser, E. (2005) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615377671.lg03
Chapter 4. Epidemiological Phenotype Hunting: Panic Disorder and Interstitial Cystitis
Weissman, M. M. (2005) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615377671.lg04
Chapter 1. Physical and Psychiatric Illness Across Adolescence: A Life Course Perspective
Costello, E. J., EGGER, H. L., & Angold, A. C. (2005) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615377671.lg01
Chapter 6. Mood Disorders and the Heart
Carbone, J. R., Gorman, J., Goodman, J., & Willems, M. B. (2005) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615377671.lg06
Chapter 7. Depression: A Major, Unrecognized Risk Factor for Osteoporosis?
Cizza, G. (2005) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615377671.lg07
- Authors
- Mors, O., Mortensen, P. B., & Ewald, H.
- Affiliations
- Aarhus University Hospital (DK)
- Corresponding author
- Mors, O
- Venue
- Schizophrenia Research
- Publisher
- Elsevier BV
- Published
- 1999-11
- Volume
- 40
- Issue
- 1
- Pages
- 67-74
- ISSN
- 0920-9964 (ISSN-L)
- OpenAlex
- W1968561766
- Cited by
- 87
- References
- 30
- Citations by year
- 2025: 1 · 2024: 2 · 2021: 4 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 3 · 2015: 5 · 2014: 5 · 2013: 8 · 2012: 2
- FWCI
- 1.28
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Schizophrenia Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Rheumatology › Rheumatoid Arthritis Research and Therapies
- Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
- Keywords
- schizophrenia, rheumatoid arthritis
- MeSH terms
- Arthritis, Rheumatoid, Denmark, Female, Follow-Up Studies, Humans, Male, Population Surveillance, Registries, Risk Factors, Schizophrenia, Case-Control Studies, Risk Assessment
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