Objective To build the normal ranges and regression equations of peak expiratory flow (PEF) in normal young, middle aged and old persosn.

目的建立正常老中青年呼气峰流量（PEF）的正常值范围及回归方程。

youdao

Symptom score and pulmonary function expressed as peak expiratory flow(PEF), peak expiratory flow rate (PEFR) and forced expiratory volume in one second (FEV1) were recorded.

观察两组每日症状评分，早、晚最大呼气峰流速测定（PEF），肺功能检查（FEV1）。

youdao