Bland-Altman plot of arterial and central venous blood Pco2 showing the regression line (solid line) and the 95% limits of agreement of −12.3 to 4.8 mmHg.

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Bland-Altman plot of arterial and central venous blood Pco2 showing the regression line (solid line) and the 95% limits of agreement of −12.3 to 4.8 mmHg (dotted lines) for the A-V difference. r = −0.01, R2 = 0.0001. Bland-Altman plot of arterial and central venous blood Pco2 showing the regression line (solid line) and the 95% limits of agreement of −12.3 to 4.8 mmHg (dotted lines) for the A-V difference. r = −0.01, R2 = 0.0001. Richard Treger et al. CJASN 2010;5:390-394 ©2010 by American Society of Nephrology