Researchers investigated sunlight exposure and sun sensitivity in relation to disability progression in multiple sclerosis (MS) via surveys among persons with MS in Belgium, and stratified data according to relapsing-onset and progressive-onset MS. Study authors used Kaplan-Meier survival and Cox proportional hazard regression analyses with time to Expanded Disability Status Scale (EDSS) 6 as outcome measure. 704 (51.3%) of the 1372 respondents had reached EDSS 6. In relapsing-onset MS, respondents reporting equal or higher levels of sun exposure than persons of the same age in the last 10 years had a decreased risk of reaching EDSS 6. In progressive-onset MS, increased sun sensitivity was associated with an increased hazard of reaching EDSS 6. Researchers concluded that higher sun exposure may be associated with better outcomes in relapsing-onset MS.
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