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A Bland–Altman difference plot to show the differences between the paired A1CNow+ and high-performance liquid chromatography (HPLC) reference results (A1CNow+ result minus HPLC reference result, y-axis) against the HPLC reference result (x-axis). Horizontal lines have been drawn at the mean difference (solid line) and at the 95% confidence intervals (CIs) of the limits of agreement (for both upper and lower limits of agreement, dashed lines).
