The correlation of spot urinary protein-to-creatinine ratio with 24-h urinary protein excretion in various glomerulopathies

Figure 2 Bland and Altman plot comparing the differences between spot urine protein-to-creatinine ratio and 24-h protein measurement against the mean of the measurement by the two methods. The mean bias is 373 mg; however, the limits of agreement are fairly wide (from -3682 to 4069 mg), particularly as the mean of the two methods rises.