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Unstandardized mean differences.
(A) Mixed venous oxygen saturation, (B) oxygen extraction ratio and (C) cardiac index of studies reporting simultaneously mixed venous oxygen saturation, oxygen extraction ratio and cardiac index. SvO2 - mixed venous oxygen saturation; SD - standard deviation; WMD - weight mean difference; 95%CI - 95% of confidence interval; O2ER - oxygen extraction ratio; CI - cardiac index.
