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. 2020 Jun 24;36(3):629–635. doi: 10.3904/kjim.2019.314

Table 2.

Sensitivity and specificity of cut-off point of FEV1/FEV6 from spirometry

FEV1/FEV6 ratio Sensitivity, % Specificity, % PPV, % NPV, %
0.73 86.7 (79.7–91.9) 89.7 (83.8–94.0) 88.0 88.5
0.74 93.3 (86.0–97.5) 70.0 (34.8–93.0) 96.6 53.8
0.77 72.7 (57.2–85.0) 77.1 (69.3–83.8) 50.0 90.0

Values are presented as percentages (95% confidence interval).

FEV1, forced expiratory volume in 1 second; FEV6, forced expiratory volume in 6 seconds; PPV, positive predictive value; NPV, negative predictive value.