Peak expiratory flow (PEF).

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Peak expiratory flow (PEF).

Forced expiratory flow at 25 and 75% of the pulmonary volume (FEF25-75%) is defined as the mean forced expiratory flow during the middle half of the FVC and measures average flow rates on an FVC segment that includes flow from medium-to-small airways 
 
Reference Ranges for Spirometry Across All Ages
 
https://www.atsjournals.org/doi/10.1164/rccm.200708-1248OC
Pdf:
https://www.atsjournals.org/doi/pdf/10.1164/rccm.200708-1248OC