Figure 3: Comparison of INR measurements between the CoaguChek XS Plus and STA-R using Bland-Altman plots in a total of 118 measurements (a), in the range of INR 1.0-2.0 (b), and in the range of INR 2.0-3.0 (c). The difference between two values in the -axis is plotted against the average of STA-R and CoaguChek XS Plus results in the -axis. The solid lines represent the mean differences in INR measurements between the two methods, and the dashed lines represent mean difference ±1.96 standard deviation (SD).