Tab.1 Serum Vit.D levels (ng/ml) in the studied groups.

	control	mild asthma	moderate asthma	sever asthma	sever asthma	sever asthma
Vit D	65.4±12.18	29.1±2.3	26.3±2.3	23.1±1.3	23.1±1.3	23.1±1.3
T.test	Control& mild	Control&moderate	Control&sever	Mild&moderate	Mild&sever	Moderate&sever
P value	0.001	0.001	0.001	0.001	0.001	0.19