Table 2.

Different studies linked with COVID-19 and various comorbidities

Study reference	Country name/study design	Number of patients	Major findings
Nishiga et al. (2020)	Multi-center cohort study in Wuhan, China	191 patients	Cardiovascular disease (CVD) patients and risk factors such as diabetes, and HTN are at extreme risk of developing COVID-19 manifestations
Manolis et al. (2020)	US	700 COVID patients	Prevalence of AF, cardiac arrest in COVID-19 patients
Gérard et al. (2020)	Israel	16 patients (case: COVID positive and control: COVID-negative groups)	No difference in the signs of auditory damage in the two groups
Ad’hiah et al. (2020)	Iraq	901 control blood group donors and 1104 COVID patients	Blood group A has an elevated the risk of developing COVID-19
Wang et al. (2020)	Wuhan, China	138 patients	CFR and mortality rate in patients with and without comorbid conditions were observed