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Related Concept Videos

Prevalence and Incidence01:08

Prevalence and Incidence

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In statistical epidemiology and health sciences, two essential metrics—prevalence and incidence—are fundamental for understanding disease dynamics within a population. These measures enable public health officials, epidemiologists, and researchers to assess the burden of diseases, allocate resources effectively, and design impactful public health policies and interventions.
Prevalence indicates the proportion of individuals in a population who have a specific disease or health...
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A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
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Epidemiology of multiple sclerosis.

E Leray1, T Moreau2, A Fromont2

  • 1Biostatistics and Epidemiology Department, EHESP, avenue du Professeur-Léon-Bernard, 35000 Rennes, France.

Revue Neurologique
|January 1, 2016
PubMed
Summary

Multiple sclerosis (MS) is a common demyelinating disease with variable prevalence globally. While France has a high MS prevalence, life expectancy is only slightly reduced, and risk factors include Epstein-Barr virus and genetics.

Keywords:
IncidenceMortalityMultiple sclerosisNatural historyPrevalenceRisk factors

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Area of Science:

  • Neurology
  • Epidemiology
  • Immunology

Background:

  • Multiple sclerosis (MS) is the most common demyelinating disease, with prevalence varying significantly by geographic region.
  • Understanding MS geographical distribution, survival, and natural history is crucial for discerning endogenous and exogenous causes.
  • France is identified as a high-risk country for MS, with a prevalence of 94.7/100,000 in 2004.

Purpose of the Study:

  • To analyze the geographical distribution, survival data, and natural history of Multiple Sclerosis (MS).
  • To investigate the roles of endogenous and exogenous factors in MS etiology.
  • To understand the implications of MS on life expectancy and identify key risk factors.

Main Methods:

  • Analysis of a large French cohort (27,603 patients) for mortality and survival data.
  • Review of epidemiological data on MS prevalence and gender ratio trends in France and other countries.
  • Examination of genetic (HLA-DRB1*15:01, immunogenetic markers) and environmental risk factors (Epstein-Barr virus, smoking, vitamin D).

Main Results:

  • MS prevalence in France was 94.7/100,000 in 2004, higher in Northern and Eastern regions.
  • Life expectancy for MS patients was reduced by 6-7 years, with no significant mortality difference in the first 20 years.
  • Epstein-Barr virus infection and smoking were confirmed as modest risk factors; genetic factors, particularly HLA-DRB1*15:01, play a major role.
  • The gender ratio for MS incidence shifted from 2:1 to 3:1 (women:men) for the relapsing-remitting form.

Conclusions:

  • MS is a multifactorial disease with significant immunogenetic implications.
  • While France is a high-risk area, MS has a limited impact on overall life expectancy.
  • Preventative strategies may emerge from understanding MS risk factors like smoking and vitamin D levels, and its two-phase natural history (inflammation followed by progressive disability).