Two-point scoring method for the evaluation of pattern hair loss by phototrichogram using a headband and a tapeline

Abstract

BACKGROUND: A phototrichogram scalp measurement method using a headband and a tapeline was introduced as a non-invasive and economical measuring technique.

OBJECTIVE: To evaluate the reliability and reproducibility of the two-point scoring method by phototrichogram using a headband and a tapeline.

METHODS: The scalp hair of seven volunteers were measured in triplicate at the 'P' and 'V' points by three dermatologists. To calculate the degree of disease progression, we used a two-point ('P' point and 'V' point) scoring method. Statistical analyses for the evaluation of inter- and intra-investigator reliability and variability were performed.

RESULTS: Overall intraclass correlation coefficients (ICCs) of intra-investigator reliability demonstrated ICCs with excellent agreement for all parameters, including the number and thickness of hair at the 'P' and 'V' points, as well as calculated degree of disease progression. ICCs of inter-investigator reliability demonstrated ICCs with excellent agreement in all parameters, except mean hair thickness at the 'P' point. Overall intra-investigator variability demonstrated coefficients of variation (CVs) ranging from 2.6% to 9.8%, whereas inter-investigator variability demonstrated CVs ranging from 2.9% to 6.3%.

CONCLUSION: We suggest that a two-point scoring using our method is a non-invasive and economical measurement technique with high reliability and reproducibility.