Table 2 Clinical characteristics of the prospective (n = 73) and retrospective (n = 161) multiple sclerosis (MS) cases

CharacteristicsProspectiveRetrospective
RR/SPMS = relapsing-remitting MS and secondary progressive MS; PPMS = primary progressive MS; PRMS = progressive-relapsing MS.
Median symptom onset age, y (range)34 (22–65)27 (12–63)
Poser diagnostic classification
    Definite MS73154
    Probable MS3
    Not classified4
Clinical subtype, n (%)
    RR/SPMS65 (89)132 (82)
    PPMS7 (10)17 (11)
    PRMS1 (1)7 (4)
    Not classified0 (0)5 (3)
MRI positive for MS56/61 (92)110/121 (91)
CSF positive for MS63/68 (93)125/137 (91)