Abstract
We thank Lawday et al. for their comments on our paper [1]. We concur with Lawday and colleagues that cohort studies should have been included in our meta-analysis in order to provide more comprehensive information. In the 47 studies included, 42 were case reports/series, and data from these case reports/series were directly combined and analyzed to obtain the conclusion that the perioperative mortality of patients with COVID-19 undergoing surgery was 6% [1]. While ideally/theoretically, cohort studies should be included in this meta-analysis, direct combining data of different literature types may affect the reliability of meta-analysis results.
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