Table 1. Risk factors for adverse outcomes in human coronavirus infections.

Risk factor	Virus	References
Advanced age	SARS-CoV-2, SARS-CoV-1, MERS	[4, 175–181]
Cardiovascular disease, hypertension and coronary artery disease	SARS-CoV-2, SARS-CoV-1, MERS	[4, 176, 179, 181–184]
Diabetes	SARS-CoV-2, SARS-CoV-1, MERS	[4, 176, 182, 183, 185–188]
Obesity	SARS-CoV-2, SARS-CoV-1, MERS	[4, 182, 183, 189]
Male Sex	SARS-CoV-2, MERS	[4, 176, 178]
Respiratory diseases	SARS-CoV-2, MERS	[4, 176, 181]
Kidney disease	SARS-CoV-2, MERS	[4, 176, 187, 190]
Immunological disorders	SARS-CoV-2	[4, 175]
Cancer	SARS-CoV-2, SARS-CoV-1	[4, 179]
Other factors	SARS-CoV-2, SARS-CoV-1	[4, 179, 180, 186, 191]