TABLE 4

Accuracy for predicting mortality of the ABCD groups classifications by Global Initiative for Chronic Obstructive Lung Disease (GOLD) 2015 and GOLD 2019 schemes

ClassificationSensitivity (95% CI)PPV (95% CI)Youden index (95% CI)
GOLD 2015 group A11.1 (9.6–12.7)6.9 (5.9–7.9)−0.23 (−0.25–−0.22)
GOLD 2015 group B11.6 (10–13.2)13.3 (11.5–15.1)−0.06 (−0.08–−0.04)
GOLD 2015 group C14.6 (12.8–16.4)20.2 (17.9–22.6)+0.01 (−0.01–+0.03)
GOLD 2015 group D62.5 (60.1–64.9)29.5 (28–31.1)+0.28 (+0.25–+0.31)
GOLD 2019 group A19.1 (17.2–21.1)9.5 (8.4–10.5)−0.23 (−0.25–−0.21)
GOLD 2019 group B43.6 (41.1–46.1)21.2 (19.8–22.6)+0.06 (+0.03–+0.09)
GOLD 2019 group C6.6 (5.3–7.8)21.7 (18–25.5)+0.01 (0.0–+0.02)
GOLD 2019 group D30.6 (28.3–32.8)32.8 (30.4–35.2)+0.16 (+0.14–+0.18)

PPV: positive predictive value.