Actual Pneumonia grade Participants n(%) Participants n(%)
Training cohort Validation cohort
0 99 (48.29%) 47 (50.00%)
1 70 (34.15%) 22 (23.40%)
2 23 (11.22%) 18 (19.15%)
3 12 (5.85%) 6 (6.38%)
4 1 (0.49%) 1 (1.06%)