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Fig. 3 | BMC Pulmonary Medicine

Fig. 3

From: Validity of a portable spirometer in the communities of China

Fig. 3

Bland–Altman plots for the evaluated spirometric parameters: FEV1, FVC, FEV1/FVC, MMEF, PEF, FEF25, FEF50, FEF75. Dashed lines represent the mean difference between measurements and dotted lines the 95% limits of agreement. FEV1 forced expiratory volume in one second; FVC forced vital capacity; MMEF maximum mid-expiratory flow; PEF peak expiratory flow; FEF25 forced expiratory flow after 25% of FVC has been exhaled; FEF50 forced expiratory flow after 50% of FVC has been exhaled; FEF75 forced expiratory flow after 75% of FVC has been exhaled. Note * = measured by the portable spirometer; ** = measured by the conventional spirometer

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