الفهرس 
Introduction
• Chapter I: Bronchial AsthmaOnly 14 pages are availabe for public view
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Abstract
In summary, we found that vitamin D levels were significantly lower in children with asthma than in healthy control group. Asthmatic children with low vitamin D levels had reduced pulmonary functions, frequent asthma exacerbations, leading to more emergency department visits and more use of health services owing to more hospitalizations. Difficulty in asthma control was observed in asthmatic children with low vitamin D levels. We found a relationship between serum vitamin D levels and asthma; however, this relationship could be influenced by multiple factors such as BMI, residency, cultural and behavioral factors. In our study, vitamin D deficiency was the strongest predictor of asthma (stronger than familial history of asthma or serum IgE levels) with a familial history of vitamin D deficiency also being a predictor of asthma.