Peak expiratory flow rate values of students in Bangkok.
BACKGROUND
As there are considerable variations in normal values of peak expiratory flow rate (PEFR) shown by studies from various population, a study is required to obtain normal values of PEFR in Thai children.


OBJECTIVE
To determine the values of PEFR of students in Bangkok.


METHODS
In a cross sectional study of PEFR measured with standard Wright peak flow meter, 501 normal students, aged 5 to 15 years, from five public schools in Bangkok were investigated. In the selection process of subjects, strict criteria of "normality" were applied and included history of medical illnesses, physical examination and nutritional status.


RESULTS
The relationship between PEFR and height was approximately linear in both male and female children. Prediction equations for each sex were: Male children: PEFR (L/min) = [3.52 x Height (cm)] - 186.80 Female children: PEFR (L/min) = [3.48 x Height (cm)] - 204.11 The PEFR values of students in this study were different from the predicted values of PEFR in those of previous reports in Thai children. These discrepancies might be explained by a variety of study population and environmental factors.


CONCLUSIONS
The relationship between PEFR and height of students in Bangkok is best described by a regression equation. The prediction graphs for each sex may be used to monitor PEFR values of children with obstructive airway diseases and to compare an individual's PEFR with those of others of the same height and sex.
Benjaponpitak
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Department of Pediatrics, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
Direkwattanachai
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Kraisarin
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Sasisakulporn
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D000293:Adolescent; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D010366:Peak Expiratory Flow Rate; D012016:Reference Values; D013785:Thailand