We further explored the correlation between the predictive values of the
pneumonia risk prediction model constructed in this study and the actual
pneumonia severity rating. As mentioned in the method, patients with
pneumonia were also classified into grades 0, 1, 2, 3, and 4 according
to the extent and distribution of lung involvement (no lung involvement
was categorized as grade 0); the actual pneumonia grading results are
shown in TABLE 4. A positive linear correlation was found between the
predicted pneumonia probability of the pneumonia risk model and actual
pneumonia grade using GAM(FIGURE 5); see FIGURE 6 for examples.