The demographic and clinical characteristics of the study population.

Note: - = no data; BPF = brain parenchymal fraction; EDSS = expanded disability status scale; F = female; M = male; n/a = not applicable; relapsing patients = multiple sclerosis patients in the relapsing phase; remitting patients = multiple sclerosis patients in the remitting phase; TWMLL = total white matter lesion loads; the same abbreviations are used for all figures and tables.The demographic and clinical characteristics of the study population.