Appendix Table 1:

Results of chest CT performed within 24 hours of admission

Chest CT findings	COVID-19 positive (n=33)	COVID-19 negative (n=283)	P value
CT within first 24 hours	2/33 (6%)	60/283 (21%)	0.038
Focal consolidation
Unilateral	0/2 (0%)	15/60 (25%)	0.029
Bilateral	2/2 (100%)	9/60 (15%)
Not Present	0/2 (0%)	36/60 (60%)
Ground-glass opacities
Unilateral	0/2 (0%)	7/60 (12%)	0.200
Bilateral	2/2 (100%)	19/60 (32%)
Not Present	0/2 (0 %)	34/60 (58%)
Septal thickening
Unilateral	0/2 (0%)	3/60 (5%)	1.000
Bilateral	0/2 (0%)	10/60 (17%)
Not Present	2/2 (100%)	47/60 (78%)
Pleural effusion
Unilateral	0/2 (0 %)	6/60 (10%)	1.000
Bilateral	0/2 (0 %)	11/60 (18%)
Not Present	2/2 (100%)	43/60 (72%)
Lymphadenopathy	1/2 (50%)	15/60 (25%)	0.453