The present study was carried out in the Department of Physiology, Mahatma Gandhi Memorial Medical College, Indore (M.P.). It is a type of cross­sectional study. Study was performed after taking permission from the Ethics and Scientific Review Committee M.G.M. Medical College M.Y. Hospital, Indore and permission letter from the Head of Department of Physiology MGM Medical College, Indore and from respective school authorities. The period of study was from March 2015 to February 2016. We had selected 100 school bus drivers of age group 20­50 years. Study Design: Cross­sectional Study. 

Keywords: Auditory Reaction Time; High & Low Pitch; BMI & Normal Population.