Table 1.

Baseline characteristics of cohort subjects

Characteristic	n=469
Age in years, mean (±SD)	42 ± 10
Disease duration in years, median (± interquartile range)	5 (0, 35)
Female sex, n (%)	330 (70)
Hispanic ethnicity, n (%)	24 (5)
HLA-DRB1 positive, n (%)	214 (46)
Smoker, n (%)	56 (12)
Body mass index in kg/m2, mean (±SD)	25 ± 5
Clinically isolated syndrome, n (%)	90 (19)
Any MS treatment within prior year, n (%)	298 (64)
Use of second-line therapy in past year, n (%)	17 (4)
Use of multivitamin, n (%)	224 (48)
Use of vitamin D supplements, n (%)	40 (9)

SD= standard deviation