Fig. 6From: Saliva for assessing creatinine, uric acid, and potassium in nephropathic patientsBland-Altman plots of saliva/plasma ratio of potassium over plasma potassium in 15 controls and 35 CKD patients (open circles and closed circles, respectively). Horizontal lines are drawn at the mean difference, and at the limits of agreement, which are defined as the mean difference plus and minus 1.96 times the standard deviation of the differences in the CKD groupBack to article page