A comparative analysis showed a significant improvement of spirometric parameters in the intervention group ; pre-to-post hospitalization predicted values showed significant changes in vital capacity ( 73.1 12.6 % to 72.13 13.7 % , P < 0.001 ) , forced expiratory volume in first second ( 72.13 13.7 % to 78.98 16.9 % , P < 0.001 ) and forced expiratory flow at 25-75 % ( 64.8 35.1 % to 76.78 35.3 % , P = 0.198 ) compared to the control group that showed no significant changes across treatment .