Fig. 4
Assessments of the agreement between tcPCO2 and artPCO2 in euvolemic and hypovolemic status. A In the euvolemic status, a linear regression demonstrated a strong relationship between tcPCO2 and artPCO2 (r = 0.86, P < 0.001). N = 12. B A Bland–Altman analysis showed the mean bias was 4.1 ± 5.4 mmHg. Solid line indicated the mean difference (bias), and dash lines represent limits of agreement (mean ± 1.96 SD). N = 12. C In the hypovolemic status, there was no relationship between tcPCO2 and artPCO2 (r = 0.29, P = 0.11). n = 30. D The mean bias by a Bland–Altman analysis was 16.2 ± 11.4 mmHg. N = 30. tcPCO2, transcutaneous partial pressure of carbon dioxide; artPCO2, arterial partial pressure of carbon dioxide