Synonyms : FEF 25-75 Percent, Flow Rate, Maximal Midexpiratory, MMFR, 25-75 Percent, FEF, 25-75 Percents, FEF, FEF 25 75 Percent, FEF 25-75 Percents, Forced Expiratory Flow 025 075 Percent, Percent, FEF 25-75, Percents, FEF 25-75