FIGURE 3.

Scatter plots for instrument comparison of the advanced glycation end product (AGE) level to validate the facial glycation imaging system (FGIS). Correlations between AF_ref and (a) SGI_forearm (R = 0.64, P < .01) and (b) SGI_cheek (R = 0.40, P < .01). AGEs, advanced glycation end products; AU, arbitrary unit; AF_ref, skin autofluorescence from the volar forearm measured using the AGE Reader mu; SGI_cheek, skin glycation index from the cheek measured using the FGIS; SGI_forearm, skin glycation index from the volar forearm measured using the FGIS