Table 1: Regression analysis on the influence of age, RA vs. Lupus duration and disease type on Vit D serum level as an independent variable.

Variables	P value B	B	Lower Board	Upper Board
Disease	0.044	17.45	0.44	34.45
Age	0.77	0.07	-0.45	0.61
Duration of disease	0.06	-1.17	-2.42	0.07