Vitamin D Levels, Lung Function, and Risk Factors in Paediatric Asthma: Evidence from a Case-Control Study
Abstract
Introduction: Asthma is one of the commonest chronic respiratory disorders in children, influenced by environmental, perinatal, genetic, and nutritional factors. Vitamin D, has essential immunomodulatory functions apart from its role in bone health. Vitamin D has its implications in asthma pathogenesis and control. This study was conducted to assess the serum vitamin D levels in asthmatic and non-asthmatic children, and also to evaluate its correlation with lung function, and the role of associated risk factors. Materials and Methods: A hospital-based cross sectional, comparative study was conducted after obtaining Institutional Ethical committee approval. The study was conducted among 50 asthmatics and 50 age- and sex-matched non-asthmatic controls in the age group of 5–16 years. Baseline demographic and anthropometric data were recorded. The environmental risk factors perinatal history, familial history were obtained from the participants. Pulmonary function parameters (FVC, FEV1, FEV1/FVC, PEFR, FEF25–75) were measured by spirometry following American Thoracic Society (ATS) guidelines. Serum vitamin D levels were determined using a standard immunoassay. Age-appropriate oral or written assent was obtained from the parents. Results: The results showed significantly lower mean vitamin D levels in asthmatic children (15.75 ± 4.46 ng/ml) when compared to controls (18.85 ± 3.98 ng/ml; p < 0.001). FEV1 and FEV1/FVC ratios were significantly decreased in asthmatic children (p <…
How strong is the evidence?
Evidence Hub reads this as a case-control, done in people. Its evidence level is 4 of 5 (Low · observational). Observational designs can show an association but not prove cause.
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