Comparison of peak expiratory flow measurement by Mini-Wright peak flow meter and electronic spirometer in healthy elementary school children

Objective This study aims to compare peak expiratory flow measurement by peak flow meter and electronic spirometer in healthy elementary school children. Methods This was a cross-sectional study performed in an elementary school near Cipto Mangunkusumo hospital (SDN Pegangsaan 01). The study group consisted of healthy children aged 6-12 year old. Data regarding identity and history of illness was taken in each subject. Routine physical examination was performed and recorded. Each subject performed lung function tests by means of electronic spirometer AS-7 as well as by Mini-Wright peak flow meter. The subject should perform a minimum of three maneuvers for each method where only the best result was recorded. Method comparison test to assess agreement between two methods was employed in this study. Results There were 10 males and 15 females enrolled in this study. None of the subjects currently have any respiratory symptoms and signs. This study found that the mean peak expiratory flow (PEF) by spirometer was 226.8±73.13 L/min while by peak flow meter was 223.0±45.05. Mean difference between spirometer and peak flow meter measurements is 6.2 with standard deviation of 60.82. These values resulted in limits of agreement of -115.44 to +127.84 L/min. Conclusions This study finds disagreement between electronic spirometer and Mini-Wright peak flow meter in measuring peak expiratory flow, therefore these two devices cannot be used interchangeably. Mini-Wright peak flow meter still has a role in home monitoring, but the physician should interpret the results carefully. [Paediatr Indones 2004;44:248-252].