| Objective: To check the reliability of lung function test using a portable spirometer in healthy adults. Methods: Thirty healthy adults voluntarily participated in this study. Three-time lung function tests using portable spirometer were carried out to check the inter-rater reliability and test retest reliability of the lung function test parameters. The spirometric test was done to find out the range of values for various lung function parameters including forced vital capacity (FVC), peak expiratory flow (PEF), forced expiratory volume in first second of FVC (FEV1), forced inspiratory volume capacity (FIVC), peak inspiratory flow (PIF), FEV1/FVC, maximal expiratory pressure (MEP), maximal inspiratory pressure (MIP), and the reliability between test subjects and retest reliability was tested. Results: In terms of inter tester reliability, ICC values of FVC, PEF, FEV1, FIVC, PIF, FEV1/FVC, MEP and MIP ranged from 0.80 to 0.97, with excellent reliability. In terms of relative reliability, ICC values of FVC, PEF, FEV1, FIVC, PIF, FEV1/FVC, MEP and MIP ranged from 0.86 to 0.97, with excellent reliability. In terms of absolute reliability, the SEM and SEM% values of the evaluation results were 0.28-11.15 and 4.81-13.15%, and MDC and MDC% values were 0.37-30.91 and 13.33-36.46%, respectively. Bland Altman figure showed no systematic error, and no statistical significance was found in the comparison of lung function differences. Conclusion: In summary, portable spirometer could be reliable tools for lung function test in healthy adult. |
