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Fig. 3A. —Bar graphs show actual versus predicted proportion of deaths in each group as measured by Hosmer-Lemeshow goodness-of-fit test, which measures degree of agreement between predicted and observed death rates between groups of patients over entire range of risks. White bars represent percentage of actual deaths, and black bars represent percentage of predicted deaths. Graph shows actual (white bars) versus predicted (black bars) proportion of deaths analyzed by percentage of lung opacification by day 7 from symptom onset. Hosmer-Lemeshow goodness-of-fit test statistics = 1.7923 (p = 0.1806). Area under receiver operator characteristic curve = 0.864.