Abstract
By means of Wright's Peak Flow Meter, the expiratory peak flow rate (PFR) was measured in 1011 school children aged 7 to 17 years. Of these, 779 had no objective signs or histories of disease in the respiratory organs. This group was considered as a normal material. The normal biological variation of PFR in children was investigated for correlation to sex, age, height, and weight. The best common correlation for both sex was PFR = 5.10 × height in cm −425, and a minor sex variation of this equation was observed. The remainder of the children either had colds or had previously suffered from disease in the respiratory organs but were now symptom-free. These groups were compared with the normal material and had lower PFR values than the healthy children.
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