Table 3.

Correlations between independent variables and expanded disability status scale (EDSS)

Variable	Coefficient	P
Sex	-0.05	0.440
Age	0.29	< 0.001*
Serum vitamin D	-0.08	0.280
Disease duration	0.52	< 0.001*
Diagnostic lag	0.19	0.010*

^* P < 0.050 is considered significant