Fig. 3

a Peripheral and central lactate paired values, differences against means preoperatively. The Bland-Altman plot presents the differences against the means of peripheral and central lactate measurements obtained preoperatively. A total of 111 paired measurements were obtained. Bias was 0.14 (95% CI: 0.11–0.17, LoA: 0.30). The upper and lower LoA are presented with +/− 1.96 SD (95% CI) (dashed lines). The percentage error was 32.08%. b Peripheral and central lactate paired values, differences against means upon arrival to the ICU. The Bland-Altman plot presents the differences against the means of peripheral and central lactate measurements obtained upon arrival to the ICU. A total of 100 paired measurements were obtained. Bias was 0.16 (95% CI: 0.09–0.23, LoA: 0.70). The upper and lower LoA are presented with +/− 1.96 SD (95% CI) (dashed lines). The percentage error was 38.88%. c Peripheral and central lactate paired values, differences against means 3–4 h postoperatively. The Bland-Altman plot presents the differences against the means of peripheral and central lactate measurements obtained 3–4 h postoperatively. A total of 87 paired measurements were obtained. Bias was 0.23 (95% CI: 0.11–0.35, LoA: 0.50). The upper and lower LoA are presented with +/− 1.96 SD (95% CI) (dashed lines). The percentage error was 25.18%