Reliability and validity of the Japanese Version of Incontinence-Associated Dermatitis and its Severity（IADS）

Abstract

　The aim of this study was to determine the reliability and validity of the Japanese version of Incontinence-Associated Dermatitis and its Severity（IADS）using four original scenarios with photographs and 10 photographs of older Japanese persons with incontinence-associated dermatitis（IAD）. After receiving permission from its developers to translate the original English version of IADS, the authors translated it into Japanese and developed a Japanese version. Using four original scenarios, inter-and intra-rater reliability of 20 health-care practitioners was calculated using coefficient of variation data; the inter-rater correlation was 0.724 and intra-rater correlation 0.868. Using 10 photographs of older Japanese persons with IAD, the inter-rater correlation was 0.359 and intra-rater correlation 0.403. Criterion-related validity was determined by comparing IADS scores and concordance rate of 19 testers with those of a wound, ostomy and continence expert for each category. Using four original scenarios, Spearman’s rank-correlation coefficient of IAD severity scores were from 0.400 to 1.000 and concordance rate for each category as follows: none, 80.0％; red, 55.5％; rash, 36.9％; and skin loss, 51.7％. Using 10 photographs of older Japanese persons with IAD, Spearman’s rank-correlation coefficient of IAD severity scores was from - 0.016 to 0.66 and concordance rate for each category as follows: none, 60.0％; pink, 56.8％; red, 33.1％; rash, 45.5％; and skin loss, 40.3％. These results suggest that the Japanese version of the IADS has satisfactory reliability and validity for persons with light skin color and IAD; however, it is not accurate for yellow skin color or areas of pigmented skin.