| Autor: |
Hee Ung Park, MD, Kyung Bae Chung, MD, Do-Young Kim, MD, PhD |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
JAAD International, Vol 15, Iss , Pp 121-126 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2666-3287 |
| DOI: |
10.1016/j.jdin.2024.02.005 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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