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The effectiveness of Azvudine in reducing the risk of composite disease progression outcome and risk of all-cause death by subgroups of selected baseline characteristics. Abbreviation, COPD, chronic obstructive pulmonary disease. Ellipsis (…) means that the model does not converge due to few outcomes; Horizontal lines indicate the ranges of the 95% CIs and the vertical dash lines indicate the hazard ratio of 1.
