RESULTS	For the 3.68-microm aerosol , I :O ratios averaged 2.29 + / -1.45 and 2.54 + / -1.48 ( p > 0.05 ) , indicating that aerosol distribution within the lungs was unchanged while breathing at 12 + / -2 L/min vs. 31 + / -5 L/min , respectively .\