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High incidence and prevalence of MS in Møre and Romsdal County, Norway, 1950–2018
Open accessAbstract
OBJECTIVE: To determine prevalence and longitudinal trends in incidence of MS in Møre and Romsdal County, Western Norway, from 1950 to 2018. METHODS: Retrospective longitudinal population-based observational study. All patients diagnosed, or living, with MS in Møre and Romsdal were identified as incident or prevalent cases from local, regional, and national sources. We compiled the data in the Norwegian Multiple Sclerosis Registry and Biobank and used the aggregated data set to calculate incidence and prevalence rates using population measures obtained from Statistics Norway. RESULTS: < 0.001) increase in average annual incidence rates from 2.1 (95% CI, 1.3-3.3) to 14.4 (95% CI, 11.9-17.3) per 100,000. From 2005 through 2017, the incidence among women increased from 17.1 (95% CI, 14.0-20.7) to 23.2 (95% CI, 18.7-28.5) per 100,000, whereas the incidence among men declined from 10.3 (95% CI, 7.9-13.2) to 5.9 (95% CI, 3.4-8.8) per 100,000. CONCLUSION: Møre and Romsdal County in Western Norway has the highest prevalence of MS reported in Norway. The incidence has steadily increased since 1950, and during the latest 15 years, we observed opposing trends in sex-specific incidence rates.
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“The reasons for this are multifactorial, and often involve systemic barriers to healthcare access. Although many studies have reported such diagnostic delay in MS care [8–12], only a few have documented specific misdiagnoses that were responsible for such delays (Table 1).”
From Functional neurological disorder and multiple sclerosis: a systematic review of misdiagnosis and clinical overlap (2022) · cites this paper as [10]
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Diagnosis of multiple sclerosis: 2017 revisions of the McDonald criteria
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Walzl, D., Solomon, A. J., & Stone, J. (2022) · Journal of Neurology · doi:10.1007/s00415-021-10436-6 · Cited by 62
Metadata
- Authors
- Willumsen, J. S., Aarseth, J. H., Myhr, K.-M., & Midgard, R.
- Affiliations
- Norwegian University of Science and Technology (NO)
- Corresponding author
- Willumsen, Johannes Sverre
- Venue
- Neurology Neuroimmunology & Neuroinflammation
- Published
- 2020-05
- Volume
- 7
- Issue
- 3
- ISSN
- 2332-7812 (ISSN-L)
- PMC
- PMC7136041
- OpenAlex
- W3013333833
- Cited by
- 24
- References
- 1
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 2 · 2023: 4 · 2022: 5 · 2021: 5 · 2020: 1
- FWCI
- 2.47
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by-nc-nd
- Locations
- Neurology Neuroimmunology & Neuroinflammation (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- NORA - Norwegian Open Research Archives (submittedVersion, cc-by-nc-nd)
- Funders
- Norges Teknisk-Naturvitenskapelige Universitet
- Topics
- Health Sciences › Medicine › Clinical Neurology › Multiple Sclerosis Research Studies
- Health Sciences › Medicine › Oncology › Polyomavirus and related diseases
- Health Sciences › Medicine › Clinical Neurology › Peripheral Neuropathies and Disorders
- Keywords
- multiple sclerosis, incidence trends, prevalence, sex differences, Western Norway, population-based registry
- MeSH terms
- Adolescent, Adult, Aged, Female, Humans, Longitudinal Studies, Male, Middle Aged, Norway, Registries, Retrospective Studies, Sex Factors, Incidence, Prevalence, Biological Specimen Banks, Multiple Sclerosis, Chronic Progressive, Multiple Sclerosis, Relapsing-Remitting, Young Adult
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- Willumsen, J. S., Aarseth, J. H., Myhr, K.-M., & Midgard, R. (2020). High incidence and prevalence of MS in Møre and Romsdal County, Norway, 1950–2018. Neurology Neuroimmunology & Neuroinflammation. https://doi.org/10.1212/nxi.0000000000000713
