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. 2023 Oct 26;18:2341–2352. doi: 10.2147/COPD.S429104

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© 2023 Cheng et al.

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Time-dependent ROC curve and C-index analysis between GOLD 2017 and 2023 group classification in predicting all-cause mortality.

Notes: (A and B) Time-dependent ROC curve (A) and C-index (B) analysis between GOLD 2017 ABCD group and GOLD 2023 ABE group in predicting all-cause mortality; (C and D) Time-dependent ROC curve (C) and C-index (D) analysis between GOLD 2017 1A–4D group and GOLD 2023 1A–4E group in predicting all-cause mortality.

Abbreviations: COPD, chronic obstructive pulmonary disease; GOLD group was classified using Global Initiative for Chronic Obstructive Lung Disease (GOLD) criteria; ROC, receiver operating characteristic; AUC, area under receiver operating characteristic curve; C-index, concordance index.