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KMID : 0604520130390020105
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Journal of the Society of Cosmetic Scientists of Korea
2013 Volume.39 No. 2 p.105 ~ p.115
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Investigation of the Study Plan and Statistical Method of Functional Cosmetics on Human Skin
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Seo Young-Kyung
Koh Jae-Sook
Lee Won-Chul
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Abstract
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In Korea, the human skin tests to evaluate the anti-wrinkles and whitening effect have been accomplished in accordance with the KFDA guideline. Regarding the data of the visual assessment and machinery evaluation of the results for the human skin test, unpaired t-test have been used in order to compare between the test and the control groups and paired t-test for the comparison of effects for before and after. Descriptive statistics such as frequency analyses was used for the questionnaire evaluation data. In many cases of the European and American clinical test centers, the methodology and the statistical analysis were similar to ours. But, the documentation obtained by repeated application from identical individual has high relation. For this reason, it is desirable to apply RM ANCOVA and RM ANOVA to a visual assessment and machinery evaluation. We suggested that RM ANCOVA and RM ANOVA is the new approach to statistical analysis of human test data of functional cosmetics.
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KEYWORD
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clinical statistics, functional cosmetics, repeated measures ANOVA, repeated measures ANCOVA
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