Table 4.

The results of the performed updated SHAP clustering to generate a mortality risk stratification system.

Characteristics	Cluster 1	Cluster 2	Cluster 3	Cluster 4
Count	23	10	7	6
Mortality rate (%)	0.04 ± 0.021	0.50 ± 0.53	0.71 ± 0.49	0.83 ± 0.41
HR-O2	40.07 ± 10.69	41.31 ± 10.70	80 ± 0.00	80 ± 0.00
FI-FiO2	34.07 ± 7.69	33.67 ± 7.16	80.00 ± 0.00	51.60 ± 11.36
HV-NEUT	5.68 ± 1.91	14.59 ± 3.60	9.04 ± 4.09	9.07 ± 4.76
FI-RR	22.78 ± 4.17	26.10 ± 7.29	28.71 ± 6.82	30.17 ± 6.46
LV-CRP	28.83 ± 14.59	38.44 ± 33.25	89.35 ± 62.95	106.84 ± 58.60

Note. FI: first inpatient; FiO2: fraction of inspired oxygen; HR: highest requirement; HV: highest value; LV: lowest value; NEUT: neutrophils; O2: oxygen; RR: respiratory rate; SD: standard deviation.