646 Analysis of statistics for facial image color between ages

Abstract

Most women want to be look younger than their age and care about youthful-looking skin color. Several studies have reported age-related skin color changes. However, they did not investigate the changes in skin color skewness and kurtosis. The aim of this study was to investigate the age-related changes in several skin color parameters (mean, standard deviation (SD), skewness, and kurtosis), and to find out the clues for youthful-looking skin color. Total 160 Korean females (45.13 ± 14.61 y.o.) participated in this study. Digital facial images were obtained using VISIA-CR (Canfield science, USA) and the color data (sRGB) of cheek were calculated using Image-pro plus (Media Cybernetics, USA). These values were then transformed to Quasi-L*a*b*(Q-L*a*b*) by reported method, and statistical parameters of individual Q-L*a*b* were calculated using Microsoft Excel 2007 (Microsoft Corporation, USA). Statistical analysis was performed using SPSS 23.0 (IBM, USA) with a significance level of p < 0.05. All procedures were performed according to the tenets of the declaration of Helsinki. There were significant difference in mean and SD values of Q-L*a*b* among different age groups and the following values were significantly correlated with age [(mean Q-L*a*b*: r = -0.458, r = 0.476, r = 0.445), (SD of Q-L*a*b*: r = 0.329, r = 0.466, r = 0.580), (Skewness of Q-L*a*b*: r = 0.242, r = -0.240, r = -0.201), (kurtosis of Q-b* : r = -0.168), respectively]. Multiple regression analysis was performed with twelve different statistical variables including age. According to the regression equation, skin yellowness and redness are more important factors than skin lightness in age-related skin color changes. In addition, mean and SD values were also more important than skewness and kurtosis. These results indicate that neutralizing yellow skin tone with anti-glycation and make-up could be effective to enhance skin color, and it is enough to consider mean and standard deviation values of Q-L*a*b* without skewness or kurtosis to study age-related skin color changes.