Evidence map›Paper›PMID 26046556›Full record

ReviewActa neurologica Scandinavica2015

Time trends in the incidence and prevalence of multiple sclerosis in Norway during eight decades.

N Grytten, Ø Torkildsen, K-M Myhr

Abstract readReview
In one paragraph

Review in Acta neurologica Scandinavica, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

26 citing papers in PubMed.

  1. Article
  2. Review
  3. Article
  4. Advancements in multiple sclerosis.Internal medicine journal · 2025
    Review
  5. Review
  6. Article
  7. Article
  8. Review
  9. High incidence and prevalence of MS in Møre and Romsdal County, Norway, 1950-2018.Neurology(R) neuroimmunology & neuroinflammation · 2020
    Observational
  10. Review
  11. Article
  12. Review
  13. Article
  14. Article
  15. Review
  16. Review
  17. Article
  18. Therapeutic Targets for Multiple Sclerosis: Current Treatment Goals and Future Directions.Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics · 2017
    Review
  19. Article
  20. Review
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors.

N GryttenKG Jebsen MS Research Centre, Department of Clinical Medicine, University of Bergen, Bergen, Norway.
Ø TorkildsenKG Jebsen MS Research Centre, Department of Clinical Medicine, University of Bergen, Bergen, Norway.
K-M MyhrKG Jebsen MS Research Centre, Department of Clinical Medicine, University of Bergen, Bergen, Norway.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Norway has been subjected to numerous epidemiological investigations on the prevalence and incidence of multiple sclerosis (MS), dating back to 1935. The objective of this study was to review the studies on the prevalence and incidence of MS in Norway, provide an update on the prevalence of MS in Norway, and describe the time trends in the prevalence and incidence of MS in relation to risk factors, case ascertainment, and data. We performed a systematic search on PubMed and MEDLINE up to November 2014 using the search string 'multiple sclerosis prevalence in Norway' or 'multiple sclerosis incidence in Norway'. In addition, we scrutinized the reference lists of the publications identified for relevant citations. We retrieved data on the distribution of MS in Norway on December 31, 2013 from the Norwegian Multiple Sclerosis Registry and Biobank and the Norwegian Patient Registry. We identified 29 articles. From 1961 to 2014, the reported prevalence of MS increased from 20 to 203 per 100,000 inhabitants, and the incidence increased from 1.9 to 8.0 per 100,000. The nationwide crude prevalence in Norway, based on the Norwegian Patient Registry, was 208 per 100,000 on December 31, 2013. The reported prevalence of MS in Norway has increased 10-fold, with several possible causes. During eight decades, neurological health services have generally become more accessible to the population, and transforming diagnostic criteria has made the diagnosis of MS more precise and valid. There have also been changes in lifestyle behavior and known risk factors, such as vitamin D and smoking, that might have contributed to the increased incidence of MS. A possible role of increased survival in MS needs to be examined further.

Indexed as

Biological Specimen BanksEmigration and ImmigrationFemaleHumansIncidenceMaleMultiple SclerosisNorwayPrevalenceSex Ratioenvironmental risk factorsincidencemultiple sclerosisprevalencetime trends

Identifiers

PMID26046556
PMCPMC4657466

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.