Conducting and critically appraising a high-quality systematic review and Meta-analysis pertaining to COVID-19

With constantly emerging new information regarding the epidemiology, pathogenesis, diagnosis and management of Coronavirus Disease 2019 (COVID-19), reviewing literature related to it has become increasingly complicated and resource-intensive. In the setting of this global pandemic, clinical decisions are being guided by the results of multiple pertinent studies; however, it has been observed that these studies are often heterogenous in design and population characteristics and results of initial trials may not be replicated in subsequent studies. The resulting clinical conundrum can be resolved by high-quality systematic review and meta-analysis with a robust and reliable methodology, encapsulating and critically appraising all the available literature relevant to the clinical scenario under scrutiny. It can condense the large volume of scientific information available and can also identify the cause of differences in the degree of effect under consideration across different studies. It can identify optimal diagnostic algorithms, assess efficacy of treatment strategies, and analyze inherent factors influencing the efficacy of treatment for COVID-19. The current review aims to provide a basic guide to plan and conduct a high-quality systematic review and meta-analysis pertaining to COVID-19, describing the main steps and addressing the pitfalls commonly encountered at each step. Knowledge of the basic steps would also allow the reader to critically appraise published systematic review and meta-analysis and the quality of evidence provided therein.