MB and COVID-19: The pooled findings showed no significant differences between the two groups of COVID-19 patients on myocardial enzymes and myoglobin, including CK [WMD = − 3.01 U/L; 95% CI − 12.91, 6.90, P = 552; I2 = 51.7% (with 14 studies)], troponin I [SMD = 0.27; 95% CI − 0.14, 0.67, P = 0.193; I2 = 77.3% (with 5 studies)], and myoglobin [WMD = 8.11 ng/mL; 95% CI − 6.10, 22.33, P = 0.263; I2 = 73.2% (with 3 studies)] (Additional file 2: Appendix 2c, Fig: A–C).