Demographic and clinical characteristics of subjects with RIS.

n.p. = not performed.DIT = dissemination in time.CSF = cerebrospinal fluid.See text for other abbreviations.∧+: presence of cervical spine lesion; -: absence of signal abnormalities.*+: presence of oligoclonal bands and/or abnormal IgG Index; -: normal pattern.#+: presence of abnormal P100 in at least one of the eyes; -: normal pattern.$+: failure of ≥2 tests at the Rao Brief Repeatable Battery; -: failure of ≤1 test.