Prevalence, Incidence, and Mortality of Multiple Sclerosis in Coimbra, Portugal

Multiple sclerosis (MS) is the most common chronic inflammatory, demyelinating, and neurodegenerative disease of the central nervous system in young adults, representing the leading cause of nontraumatic disability in this population. The rising prevalence of MS worldwide makes it critical to recognize the absolute number of patients with MS, demanding the execution of a sustainable healthcare policy. In Portugal, only six studies evaluating MS rates were published, disclosing a prevalence of 64 cases per 100,000 persons and an incidence of 3.1 cases per 100,000 persons/year, but the mortality rates have not been reported. Thus, this observational, cross-sectional study aimed to assess MS prevalence, incidence, and mortality in the city of Coimbra, a region in the center of Portugal. Patients who fulfilled McDonald's Diagnosis Criteria (2017) for MS were recruited. Inclusion criteria were defined according to prevalence, incidence, and mortality studies. The baseline demographic and clinical characterization of the prevalence study population was performed. The MS prevalence rate in Coimbra was 143.45 cases per 100,000 inhabitants. Between 2018 and 2021, the cumulative incidence was 8.52 new cases per 100,000 persons/year. The mortality rate between 2018 and 2021 was 2.84 deaths per 100,000 inhabitants. MS prevalence and incidence in Coimbra are higher than reported in previous similar studies and comparable to Europe's mean prevalence and incidence.