FIG. 1.

Smoothed frequency distribution of the hemoglobin A1c (HbA1c) values measured by the A1CNow⁺ and high-performance liquid chromatography (HPLC) tests. In total, 1,618 paired data samples of A1CNow⁺ test results and HPLC reference values were analyzed. The population percentage on the y-axis is plotted against HbA1c values on the x-axis. Curve fitting and loess smoothing were performed using MATLAB version2007a software. Data given represent the median values. The Kolmogorov–Smirnov test was used for normal distribution analysis. IQR, interquartile range. Color images available online at www.liebertonline.com/dia