Associations between onset age and disability in multiple sclerosis patients studied using MSSS and a progression model.BACKGROUND
 Disability was assessed using Multiple Sclerosis Severity Scale (MSSS) and, a model based on time to reach an Extended Disability Severity Score (EDSS) (progression model).  The association between disability (assessed by both MSSS and the progression model) and onset age was different in patients whose MS onset occurred after an age band of 30-35 years. 
MSSS
The association between disability (assessed by both MSSS and the progression model) and onset age was different in patients whose MS onset occurred after an age band of 30-35 years. 
the progression model