Figure 2: Comparison of INR measurements between the CoaguChek XS Plus and the STA-R using Passing/Bablok regression analysis. The solid lines indicate the regression lines, and the dashed lines indicate the 95% confidence interval (CI). (a) In a total of 118 measurements, Passing-Bablok regression analysis gave a slope of 1.22 (95% CI, 1.16–1.28) and an intercept of −0.23 (95% CI = −0.32–0.14). (b) In the range of INR 1.0-2.0 (), it gave a slope of 1.20 (95% CI, 1.11 to 1.30) and an intercept of −0.21 (95% CI, −0.35 to −0.9). (c) In the range of INR 2.0-3.0 (), it gave a slope of 1.72 (95% CI, 1.33 to 2.31) and an intercept of −1.36 (95% CI, −2.36 to −0.48).