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Abstract : Obesity represents one of the major health problems of modern life and directly affects respiratory mechanics. So the objective of this study is to detect the impact of body mass index (BMI) on spirometric parameters among a sample of the adult population in Egypt and to detect which of the spirometric parameters is majorly affected. We retrospectively included 80 participants > 18 years old with normal pulmonary function (forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) > 80% and forced expiratory volume in 1 second/forced vital capacity (FEV1/FVC)> 70% of predicted) visiting Ain Shams University hospital, between March 2019 and October 2019 then they were divided into 3 groups according to the BMI. Statistical significant decrease in FVC, FEV1, FEV1/FVC %, and FEF 25 -75 % were found as BMI increases and there was a negative correlation between BMI and spirometric parameters.

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