FIG. 3.

In vivo glucose estimation for a single day using a linear regression model for (a) the individual 532 nm laser, (b) the individual 635 nm laser, and (c) the combined laser wavelengths shown on a Clarke error grid. Note the large error (above 30 mg/dL) and mean absolute relative difference (above 10%) for each of the individual wavelengths because of the motion, due to cardiac cycle and respiration, but that the error and mean absolute relative difference are significantly reduced (20 mg/dL and 5.4%, respectively) relative to the individual wavelength models when both wavelengths are used. Color images available online at www.liebertonline.com/dia