Reproducibility of a dermoscopic method (7FFM) for the diagnosis of malignant melanoma

Abstract

Dermoscopy improves sensitivity in the diagnosis of melanoma. We have developed a new diagnostic dermoscopic method which evaluates only seven dermoscopic features or criteria. We called the method Seven features for melanoma (7FFM). To present and to evaluate the reproducibility of our dermoscopic diagnostic method (7FFM) we held eight dermoscopic courses from 10/4/96 to 04/03/98 in various Italian cities. In fact the reliability of a diagnostic test or method mainly depends on the level of agreement in the interpretation of results among different observers. Only methods with good agreement can be used in clinical practice for the diagnosis of melanoma. Many dermatologists (207) attended one of the eight dermoscopic courses: each course was one-day in length and at the end of the course the participants evaluated a set of 25 dermoscopic slides using our dermoscopic method. Percentages of concordance and K values for a kappa statistical analysis to evaluate inter-rater reliability have been calculated. The method showed a mean percentage of concordance of 85.7%, median 88%, a mean K value of 0.699, median 0.684. These data point to a good agreement level. Our method shows good reproducibility after a short training program.