RESUMO
In the management and evaluation of asthma, simple instruments for measurements of peak expiratory flow rate [PEFR] are necessary. The aim of this study was to determine normal PEFR of the healthy children in Babol, Iran. This study was randomly done on 1050 students [primary and secondary schools] in Babol. Mini-Wright peak flow meter was used for measurement of PEFR. The range of age, weight and height were defined. Information was statistically analyzed by SPSS, T-Test and R2 and due to formula with regression. Mean age of 1050 students [525 male and 525 female] who participated in this study was 10.26 years. The mean of PEFR was 262.35+/-71.97 L/Min. Obtained PEFR with all anthropometrics variants indicate a high correlation. Correlation between PEFR and height was more significant and between PEFR and weight was lower, and according to importance of height and age, forumlas suggested for prediction of PEFR in females [[agex4/8+ [heightx0/ 6]-25]] and in males [[[agex1/7]+ [heightx2/1]-208]]. The results of this study can determine normal PEFR and it can be useful for treatment and monitoring of children with asthma who live in this region