Table 1.

Demographic variance across diagnosis model test datasets.

	Training vs. Brown-April	Training vs. External	Training vs. Xiangya-February
Positive PCR Only
Sex	0.499	<0.001	0.343
Age	0.079	0.010	<0.001
Negative PCR Only
Sex	<0.001	<0.001	<0.001
Age	<0.001	<0.001	<0.001
All patients
Sex	<0.001	<0.001	<0.001
Age	<0.001	<0.001	<0.001

P-values were calculated using ANOVA and two-sample t-tests between the training dataset and each testing sample set.