Objectives We conducted a systematic literature review and meta-analysis of observational
studies to investigate the association between diabetes, hypertension, body mass index …

METHODS Electronic databases, including PubMed, EMBASE, Cochrane Library, Science
Direct, Google Scholar, were systematically searched from the initiation of the database until …

Introduction: Given the ongoing coronavirus disease 2019 (COVID-19) pandemic and the
consequent global healthcare crisis, there is an urgent need to better understand risk factors …

Introduction The highly infectious coronavirus disease 2019 (COVID-19) has now rapidly
spread around the world. This meta-analysis was strictly focused on the influence of …

Background The severity and mortality from COVID-19 infection vary among populations.
The aim of this study was to determine the prevalence and predictors of mortality among …

Purpose The first novel coronavirus disease-19 (COVID-19) case in the Kingdom of Saudi
Arabia (KSA) was reported in Qatif in March 2020 with continual increase in infection and …

Introduction. Tobacco use increases risks for numerous diseases, including respiratory
illnesses. We examined the literature to determine whether a history of tobacco use …

Objective To systematically investigate the relationship between cardiac biomarkers and
COVID-19 severity and mortality. Methods We performed a literature search using PubMed …

Background Patients' race and ethnicity may play a role in mortality from Covid-19. Studies
in China, the US, and Europe have been conducted on the predictors of Covid-19 mortality …

Risk factors for in-hospital mortality of COVID-19 patients in Saudi Arabia have not been well
studied. Previous reports from other countries have highlighted the effect of age, gender …