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Sunday, March 25, 2018

Sun Exposure Associated with Lower MS Risk

Neurology; ePub 2018 Mar 7; Tremlett, et al
March 20, 2018

Living in high ambient UV-B areas during childhood and the years leading up to multiple sclerosis (MS) onset was associated with a lower MS risk, according to a recent study. Furthermore, high summer sun exposure in high ambient UV-B areas was also associated with a reduced risk. Persons with MS (n=151) and age-matched controls (n=235) from the Nurses' Health Study cohorts completed questionnaires that assessed summer, winter, and lifetime sun exposure history. Relative risks and 95% confidence intervals were estimated via conditional logistic regression with adjustment for body mass index, ancestry, smoking, and vitamin D supplementation. They found:


  • Most participants were white (98%); the mean age at MS onset was 39.5 years.
  • Living in high (vs low) UV-B areas before MS onset was associated with a 45% lower MS risk.
  • Similar reduced risks (51%–52%) for medium or high exposure were observed at ages 5 to 15 years and at 5 to 15 years before MS onset.
  • At age 5 to 15 years, living in a high (vs low) UV-B area and having high (vs low) summer sun exposure were associated with a lower MS risk.


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