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Quantitative measurement of hair diameter diversity as a diagnostic indicator of androgenetic alopecia in Korean males: A cross-sectional study

Authors
 Hee Ung Park  ;  Kyung Bae Chung  ;  Do-Young Kim 
Citation
 JAAD International, Vol.15 : 121-126, 2024-02 
Journal Title
JAAD International
ISSN
 * 
Issue Date
2024-02
Keywords
Korean ; androgenetic alopecia ; diagnostic criteria ; hair thickness ; phototrichogram ; threshold
Abstract
Background: The conventional 20% threshold for hair diameter diversity (HDD), widely accepted for diagnosing androgenetic alopecia (AGA) in the vertex area, has not quantitatively analyzed. Objective: To validate the HDD 20% threshold for AGA and develop a refined, Korean-specific criterion. Methods: This study involved 240 male patients with AGA, categorized by the V stages of the basic and specific classification. Phototrichogram images of the vertex region were analyzed using Image J software for hair thickness measurement. Results: Receiver operating characteristic curve analysis determined the 45 μm hair diameter threshold as the most diagnostic for AGA, with an area under the curve value of 0.884 and a Youden index of 0.659. Optimal AGA diagnosis was achieved when over 21% of hair had a diameter of ≤45 μm. Limitations: Restriction to Korean male limits its applicability to a broader population, and using a specific hair diameter threshold does not account for individual variations in hair characteristics. Conclusion: The study validates the conventional HDD 20% threshold and proposes a more appropriate 45 μm threshold for Korean males, beyond the 40 μm. It concludes that while the HDD 20% remains a key method for early detection of vertex AGA, the definition of thin hair should be ethnicity-specific.
Files in This Item:
T202402710.pdf Download
DOI
10.1016/j.jdin.2024.02.005
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Dermatology (피부과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Do Young(김도영) ORCID logo https://orcid.org/0000-0002-0194-9854
Chung, Kyung Bae(정경배) ORCID logo https://orcid.org/0000-0002-2121-3553
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/199207
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