Cost-of-Illness Progression Before and After Diagnosis of Multiple Sclerosis: A Nationwide Register-Based Cohort Study in Sweden of People Newly Diagnosed with Multiple Sclerosis and a Population-Based Matched Reference Group.

ABSTRACT

BACKGROUND: Multiple sclerosis (MS) is a chronic disease associated with increased healthcare utilisation and productivity losses. OBJECTIVE: The objective of this study was to explore the progression of healthcare costs and productivity losses before and after diagnosis of MS in comparison to that of a population-based matched reference group. METHODS: We conducted a nationwide, Swedish register-based cohort study of working-aged people with MS diagnosed in 2010-12 (n = 1988) and population-based matched references without MS (n = 7981). Nine years of observation spanned from 4 years prior (Y-4) to 4 years (Y+4) after the year of diagnosis (Y0). Differences in annual all-cause healthcare costs (inpatient and specialised outpatient healthcare as well as pharmacy-dispensed prescribed drugs) and costs of productivity loss (days with sickness absence and disability pension) were estimated between the people with MS and references using t tests with 95% confidence intervals. The average excess costs of MS were estimated using generalised estimating equation models. RESULTS: People with multiple sclerosis had higher costs before the diagnosis of MS and also thereafter. The mean differences in healthcare costs and productivity losses between the people with MS and matched references in Y-4 were 216 EUR (95% confidence interval 58-374) and 1540 EUR (95% confidence interval 848-2233), with larger cost excesses observed in later study years. Summarising the 9 study years, people with MS had fivefold higher excess healthcare costs than references, and more than twice as high productivity losses. CONCLUSIONS: Excess healthcare costs and productivity losses occur already before the diagnosis of MS and increase with time. The excess costs findings before diagnosis could suggest that an earlier diagnosis might lead to reduced excess costs of MS over time.

Multiple sclerosis (MS) is a neurological disease that can affect many parts of everyday life, including work. We studied the extra costs related to MS. Extra costs were defined as the difference in costs between people with MS and the general population in Sweden. To do this, we compared the costs of working-aged individuals with MS from 4 years before to 4 years after the year of MS diagnosis with those of individuals without MS. For each year, we measured the healthcare consumption and days absent owing to sickness absence or a disability pension. We found that people with MS had larger costs already before the diagnosis of MS. For all types of costs we studied, there were extra costs. The extra costs became larger with time and had a steep increase around the year of MS diagnosis. When we summarised the costs from all 9 years, people with MS had five times higher annual costs related to healthcare consumption than those without MS. There were also twice as high costs for lost production from days absent with sickness absence or a disability pension. While our data from national registers had objective measurements of the included costs, it did not include information on the costs for drugs administered in healthcare, rehabilitation or informal care from family members. We studied the costs of all people diagnosed with MS in 2010­12 in Sweden, related their disease trajectory with their costs, as well as compared their costs with the costs of a group from the general population. Our results of the extra costs of MS prior to diagnosis could suggest an unmet need. Earlier diagnosis and quickly starting treatment may lead to lower extra costs of MS over time.