Figure 3From: Estimation of salt intake from spot urine samples in patients with chronic kidney disease Bland-Altman analysis of the differences between estimated and measured sodium excretion compared to the average sodium excretion by the two methods. The mean difference was -10.9 (central line). A total of 94% (90 of 96) of the values lie within 1.96 SDs of the mean (outer lines)Back to article page