Simple demographic characteristics and laboratory findings on admission may predict in-hospital mortality in patients with SARS-CoV-2 infection: development and validation of the covid-19 score

Table 2 Cut-off points for predicting in-hospital mortality: results of the classification and regression tree analysis in developing cohort

Variable	Cut-off point	Global cross-validation cost	SD of the global cross-validation cost
Age (years)	> 56	0.37	0.04
Male sex	Male sex	0.43	0.05
Hemoglobin, g/dL	< 10.55	0.61	0.04
Mean corpuscular volume, fL	> 92.9	0.41	0.04
Leukocyte count, 10³/µL	> 9.635 or < 2.64	0.28	0.04
Platelet count, 10³/µL	< 81.49 or > 315.5	0.44	0.04
C-reactive protein, mg/dL	> 51.14	0.32	0.04
Creatinine, mg/dL	> 1.115	0.31	0.04
Sodium, mEq/L	< 134.7 or > 145.4	0.51	0.04
Potassium, mEq/L	< 3.65 or > 6.255	0.45	0.05

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