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A modified grading strategy for COVID-19. (A) Current classification system. (B) A risk stratification system on the basis of IL-6 and current classification system. (C) Death constituent ratio of the two grading methods. The data in the pie chart indicate death constituent ratio (%) in each group. (D) Comparison of the efficacy of the medium-risk group in identifying non-critical patients with fatal outcome between the two methods. ***P < 0.001.
