Fig. 1
a Peripheral and central venous oxygen saturation paired values, differences against means preoperatively. The Bland-Altman plot presents the differences against the means of peripheral and central venous oxygen saturation measurements obtained preoperatively. A total of 114 paired measurements were obtained. Bias was 13.37 (95% CI: 11.52–15.22, LoA: 19.10). The upper and lower LoA are presented with +/− 1.96 SD (95% CI) (dashed lines). The percentage error was 22.08%. Abbreviations: SpvO2: peripheral venous oxygen saturation. ScvO2: central venous oxygen saturation. b Peripheral and central venous oxygen saturation paired values, differences against means at arrival to the ICU. The Bland-Altman plot presents the differences against the means of peripheral and central venous oxygen saturation measurements obtained at arrival to the ICU following surgery. A total of 110 paired measurements were obtained. Bias was 11.29 (95% CI: 8.81–13.77, LoA: 25.10). The upper and lower LoA are presented with +/− 1.96 SD (95% CI) (dashed lines). The percentage error was 32.39%. Abbreviations: SpvO2: peripheral venous oxygen saturation. ScvO2: central venous oxygen saturation. c Peripheral and central venous oxygen saturation paired values, differences against means 3–4 h postoperatively. The Bland-Altman plot presents the differences against the means of peripheral and central venous oxygen saturation measurements obtained 3–4 h postoperatively. A total of 92 paired measurements were obtained. Bias was 16.49 (95% CI: 14.16–18.82, LoA: 21.20). The upper and lower LoA are presented with +/− 1.96 SD (95% CI) (dashed lines). The percentage error was 26.83%. Abbreviations: SpvO2: peripheral venous oxygen saturation. ScvO2: central venous oxygen saturation