Abstract
Objective To compare the consistency of pulmonary function test （PFT） determinations by means of Medikro SpiroStar USB portable spirometry and traditional Jaeger MasterSereen IOS spirometer in people of different pulmonary function status. Methods One hundred people underwent PFT by means of both Medikro SpiroStar USB portable spirometry and traditional Jaeger MasterScreen IOS spirometer, pulmonary function of whom were either normal, or obstructive or restrictive or mixed ventilation dysfunction. Several key parameters （VC, FVC, FEV1, FEV1 % pred, FEV1/FVC） were analyzed and compared by means of in-group correlation coefficient （ICC） and Bland- Altman method. Results Compared with Jaeger spirometer, SpiroStar spirometry had no significant biases of the key pulmonary function parameters. The ICC values were as follows respectively： 0. 968, 0. 970,0. 977,0. 967 and 0. 938. The differences of two tests of the parameters were mostly （over 94%） in the range of 95% consistency interval. Conclusions Compared with traditional Jaeger spirometer, SpiroStar spirometry has no significant biases of the key pulmonary function parameters such as VC, FVC, FEV1, FEV1 %pred and FEV1/FVC. Thus, when the standardized PFT in pulmonary function lab is not available, SpiroStar USB portable spirometry will be a desirable alternative. Key words: Pulmonary function determination; Portable spirometry; Consistency comparison
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