Table 5. Comparison of serum vitamin D level and variable clinical types of psoriatic patients.

SD: Standard deviation, N: Number; **: Mild significant differences (P≤ 0.005).

Parameters	Severe psoriasis vulgaris (N = 16)	Moderate psoriasis vulgaris (N = 18)	Mild psoriasis vulgaris (N = 19)	P-Value
Serum vitamin D level (ng/ml) (mean ± SD)	19.8 ± 4.77	28.7± 3.89	34.2 ± 5.92	0.002 **