PMID: 11921053Mar 29, 2002Paper

Age-related disability in multiple sclerosis

Annals of Neurology
M TrojanoP Livrea

Abstract

There is evidence that the clinical course of multiple sclerosis is age related. The present study evaluated the relationship between age and rate of disability progression in a large hospital-based cohort of definite cases of multiple sclerosis (n= 1,463). Patients were followed every 6 to 12 months for a total period of observation of 11,387.8 person-years. Expanded Disability Status Scale scores increased significantly with increasing current age and longer duration of disease (p=0.007). Median times to reach Expanded Disability Status Scale scores of 4.0 and 6.0, assessed using an extended Kaplan-Meier method with age as a categorical time-varying covariate, were significantly longer among patients aged 20 to 35 years compared with patients aged 36 to 50 and 51 to 65 years (p < 0.0001). Significant associations were observed between mean Expanded Disability Status Scale scores and age at disease onset, current age, and the interaction of age at disease onset and current age (p < 0.001). Current age had a greater effect (59% of variability in the model) on disease severity than did age at disease onset. Furthermore, a multiplicative effect on Expanded Disability Status Scale score was observed for age at disease onset and cu...Continue Reading

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