An Interrater Reliability Study of Pulmonary Function Assessment With a Portable Spirometer.

BACKGROUND

In this study, we aimed to validate the agreement between pulmonary function measurements obtained with a portable spirometer and measurements obtained with conventional spirometry in Chinese pediatric and adult populations.

METHODS

Pulmonary function testing was performed to evaluate subjects enrolled at Shanghai Zhongshan Hospital ( = 104) and Shanghai Children's Medical Center ( = 103). The portable spirometers and conventional devices were applied to each subject with a 20-min quiescent period between each measurement. Pulmonary function parameters of FVC, FEV, peak expiratory flow, maximum expiratory flow at 25%, 50%, and 75% of FVC (MEF, MEF, and MEF, respectively), and FEV/FVC% were compared with intraclass correlation and Bland-Altman methods.

RESULTS

A satisfactory concordance of pulmonary function was observed between spirometry measurements obtained with portable versus conventional spirometers. Intraclass correlation indicated excellent reliability (>0.75) for all pulmonary function indicators in pediatric and adult subjects. Significant positive correlations of all variables measured with different spirometers were observed (all < .001). No significant bias was observed in either group, although limits of agreement varied. Funnel effects were observed for peak expiratory flow in pediatric subjects and for FVC, FEV, MEF, and MEF in adult subjects.

CONCLUSIONS

The portable spirometer is an alternative to the conventional device for the measurement of pulmonary function. Compared with the conventional device, the portable spirometer is expected to provide convenient, operational, and financial advantages.