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Auteur Joyce H. D. M. Westerink
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Assessment of visibility of facial wrinkle reduction by various types of observers / Joyce H. D. M. Westerink in IFSCC MAGAZINE, Vol. 7, N° 1 (01-02-03/2004)
Titre : Assessment of visibility of facial wrinkle reduction by various types of observers Type de document : texte imprimé Auteurs : Joyce H. D. M. Westerink, Auteur Année de publication : 2004 Article en page(s) : p. 31-36 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Réduction des rides' 'Douceur de peau' 'Evaluation visuelle' 'Types d'observateur' Index. décimale : 668.5 Parfums et cosmétiques Résumé : The prime objective of many facial wrinkle-reduction treatments is to achieve visible improvement. The visibility of before/after treatment differences is therefore often part of the efficacy assessment. This paper investigates whether the background knowledge of the people acting as observers in such assessments has an impact on the results, e.g., the subjects themselves are familiar with their faces, skin professionals have much experience in judging skin quality, and thus both might be more sensitive to small changes.
In a clinical study, 44 female subjects were regularly treated during a period of 12 weeks with one of three wrinkle-reduction treatments : K, L and M (placebo). Photographs were taken before treatment and after 6 and 12 weeks. Three different types of observers judged the photographs:
- Observer type I : Twenty-four lay observers were given the 0- and 6-week and the 0- and 12-week pairs of photographs of all subjects to indicate the one with the least wrinkles in a two-alternative forced-choice procedure,
- Observer type II : The subjects themselves were given the 0- and 6-week and the 0- and 12-week pairs of their own photographs (eight replications) to indicate the photograph with the least wrinkles (two-alternative forced-choice),
- Observer type III : A trained panel of skin professionals (n = 3) each gave a 9-point Fitzpatrick wrinkle-severity score for all individual 0- and 12-week photographs.
It was found that the lay observers perceived the same differences as the subjects themselves: significant improvements after 12 weeks for treatment K (P < 0.0005 and P = 0.005, respectively). No visible effects were seen for treatments L and M, but, most importantly, a significant difference between treatments K and M (placebo) (P = 0.015 and P = 0.01 for independent observers and the subjects themselves, respectively). The trained panel also identified this difference between K and M (P = 0.013) in favor of K, but here it was due to a significant deterioration over time of the ‘placebo-treated’ wrinkles (M, P = 0.03).
Thus, in conclusion, no indications were found that extra knowledge – in the form of familiarity with the own face or in the form of professional training – results in the identification of more treatments that show significantly visible wrinkle reduction.
in IFSCC MAGAZINE > Vol. 7, N° 1 (01-02-03/2004) . - p. 31-36[article]
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