FEF25Forced Expiratory Flow at 25%
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1] = forced expiratory volume in one second; FVC = forced vital capacity; FEF25 75 = forced expiratory flow between 25 and 75% of vital capacity; %pred = percent predicted Table 2.
FEF25, FEF50, and FEF75 are measures of the speed at which air exits the lung when 25%, 50%, and 75% of the FVC, respectively, remains in the lung.
1] and FEF25 75 decrements were approximately four times greater in girls than boys, corroborating other studies (82,83,103,108-112).