We have measured the inhalation profiles of asthmatic children -LSB- CHILD ; n = @ , mean forced expiratory volume in @sec ( FEV@ ) @ % predicted -RSB- , asthmatic adults ( ADULT ; n = @ , mean predicted FEV@ @ % ) , and chronic obstructive pulmonary disease ( COPD ; n = @ , mean predicted FEV@ @ % ) patients when they inhaled through an Aerolizer , Diskus , Turbuhaler , and Easyhaler using their `` real-life '' DPI inhalation technique .