Table 2.

Demographic and clinical variance across prognosis model test datasets.

	Training vs. External test	Internal test vs. External test
Demographic data
Sex	<0.001	<0.001
Age	<0.001	<0.001
Clinical data
Temperature	0.317	0.392
O2 Saturation on room air	<0.001	<0.001
White blood cell count	<0.001	0.007
Lymphocyte count	<0.001	<0.001
Creatinine	0.095	0.511
C-Reactive protein	<0.001	<0.001
Cardiovascular disease	0.029	0.020
Hypertension	0.043	0.059
COPD	0.330	0.732
Diabetes	0.233	0.676
Chronic liver disease	0.524	0.770
Chronic kidney disease	0.014	0.703
Cancer	0.322	0.689
Human Immunodeficiency Virus	0.946	0.850

P-values were calculated using ANOVA and two-sample t-tests between the training dataset and each testing sample set, with values >0.05 marked in bold.