<prompt> FEVIFVC Is decreased in?AshtmaKyphosisScoliosisFibrosis  <response>: Obstructive diseases like asthma is characterised by increased lung volumes like TLC,FRC and. RV,and reduced expiratory volumes like FEV1,FVC,FEV1FVC ratio.Restrictive diseases like kyphoscoliosis and fibrosis are characterised by lowered lung volumes like TLC,FRC,and RV,as well as FVC FEV1.But the expiratory volumes are relatively elevated when considered in relation to lung volumes,thereby normal or increased FEV1FVC ratio. Reference:Harrisons medicine-18th edition,page no:2083 