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Aging with multiple sclerosis: A longitudinal study of physical function, mental health, and memory in two cohorts of US women

Background: It is unknown how individuals with multiple sclerosis (MS) age compared to unaffected peers. Objectives: The objective of the study is to describe the impact of MS on health and functioning in aging women. Methods: We used 10-item Physical Functioning Scale (PF10) scores (from the Short Form-36 (SF-36)) and other indicators of general, physical, mental health, and memory collected repeatedly over 25 years with self-administered questionnaires among participants in the Nurses’ Health Study (n = 121,700 recruited at ages 30–55) and Nurses’ Health Study II (n = 116,429 recruited at ages 25–42) to compare women with MS (n = 733) to unaffected peers in their health and disability, and describe/quantify the burden of aging with MS. Results: Women with MS had a consistently lower PF10 by 0.9–1.7 standard deviations with greater overall variability than unaffected women. PF10-scores gradually decreased with increasing age in both groups, but MS cases declined 3–4 times faster in midlife, while decline was similar in old age. The physical function score of 45-year-old women with MS was comparable to that of 75-year-old unaffected women; 70-year-old women with MS scored similarly to 85-year-old unaffected women. MS cases also reported worse health/more disability throughout adulthood on the other indicators. Conclusion: The age-related decline in physical health is accelerated by 15–30 years in MS patients compared to unaffected peers.