Table 1. Baseline demographics of acute optic neuritis patients who completed 12 months of follow- up.

Characteristic	n=37
Age (years) (mean, SD)	35 (9)
Female (N,%)	26 (70)
Symptom duration prior to baseline testing (median days, range)	5 (1-14)
Methylprednisolone treatment (N,%)	28 (76)
Diagnosis at presentation
Clinically isolated syndrome (N,%)	31 (84)
Early RRMS* (N,%)	6 (16)
Clinical Outcome
Conversion to Clinically Definite MS by 12 months (N,%)	13 (42)
EDSS at 12 months (median, IQR)	0 (0 to 0.75).
Baseline visual acuity
LogMAR Visual acuity derived from Sloan	0.61 (0.36, 0.25 to 1.0)
100% contrast letter acuity chart (mean, SD, IQR range)
Low contrast letter acuity** (mean number	3.6 (9.0, 0 to 0)
of letters correct out of 60, SD, IQR)
Colour vision (mean correct number Ishihara plates out of 38, SD, IQR)	13.1 (14.2, 0 to 29)
Visual acuity at 12 months
LogMAR Visual acuity derived from Sloan	-0.1 (0.19, -0.2 to 0.0)
100% contrast letter acuity chart (mean, SD, IQR)
Low contrast letter acuity** (mean number of letters	27 (14.6, 20 to 36)
correct out of 60, SD, IQR)
Colour vision (correct number Ishihara plates out of 38, SD, IQR)	35.7 (7.4, 37 to 38)

^* Patients with RRMS with disease duration less than 2 years

^** Sloan charts, 2.5% contrast

RRMS = relapsing remitting MSEDSS = expanded disability status scale scoreSD = standard deviation IQR = interquartile range