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Multiple sclerosis (MS) is relatively common in the West, but rare in Japan. In the literature, there are few comparative data regarding disease severity throughout the world. The objective of this study was to compare disability in patients from a UK and a Japanese MS cohort. We retrospectively analysed the clinical features of patients with MS from a UK and Japanese MS centre. The Multiple Sclerosis Severity Score (MSSS), which adjusts the Expanded Disability Status Scale score according to disease duration, was used as a marker of disease severity. One thousand one hundred forty-eight UK patients and 104 Japanese patient were identified representing the relative national prevalence. Demographics and disease duration did not differ between the groups. Median MSSS was significantly different between the two groups (Japan 3.34 vs. UK 5.87, p < 0.001). Primary progressive MS was more common …