Abstract
Topical application of nicotinic acid results in erythema, and in some cases oedema of the skin, supporting a strong relationship between niacin sensitivity and prostaglandin D2. The aim of this study was to examine the inter-rater and intra-rater reliability of a 12-min niacin sensitivity test in healthy adults. Three raters assessed the skin reaction of 12 volunteers, over 3-min intervals across four niacin concentrations (0.1, 0.01, 0.001, and 0.0001), and over six sessions. Inter-rater reliability estimates ranged from 0.85 to 0.97 for the total niacin sensitivity score. Similar inter-rater reliability estimates were found for niacin sensitivity ratings by concentration and time. Intra-rater reliability estimates ranged from 0.63 to 0.93 for the total niacin sensitivity score. These data indicate that the 12-min topical niacin sensitivity test has excellent reliability.
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