Fig 1.
Study selection process flow chart.
Table 1.
Baseline and demographic characteristics of the included studies.
Table 2.
Risk of bias assessment—Modified Newcastle-Ottawa Scale [10].
Table 3.
Results of meta-analysis comparing laboratory parameters in COVID-19 patients.
Fig 2.
Forest plots of interleukin-6 (2A and 2B) and of ferritin (2C and 2D) in severe and fatal cases of COVID-19.