Division of Dermatology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
Biomed Res Int. 2020 Feb 10;2020:2476890. doi: 10.1155/2020/2476890. eCollection 2020.
The data of hair density and hair diameter in the Asian population, especially in Thais, are limited. We aimed to evaluate hair density and hair diameter of members of the Thai population at different scalp sites and to determine the effect of sex and aging as well as to compare the results with those in groups of other ethnicities. Healthy Thais whose hair examination findings were normal were evaluated. Two hundred and thirty-nine subjects participated in this study, of whom 79 were male and 160 were female. Hair density and hair diameter were analyzed at four different scalp sites using quantitative trichoscopic analysis. The highest hair density in Thais was observed in the vertex area. Hair densities at four different scalp sites were significantly different from one another; only hair density at the vertex site showed no significant difference from that in the occipital area. In contrast, hair diameter did not show any statistically significant differences for the different sites. We observed decreased mean hair density with increasing age and found statistically significant differences between participants in their 20s and those in their 60s, while hair diameter remained consistent. Comparing our results with a previous study in other ethnicities, the hair densities in Asians are generally lower. In conclusion, hair density in the Thai population varies at different scalp sites. Aging is a factor in declining hair density. Asians have a lower hair density compared to Caucasian and African populations.
亚洲人群，尤其是泰国人群的毛发密度和直径数据有限。我们旨在评估泰国人群不同头皮部位的毛发密度和直径，并确定性别和年龄的影响，同时将结果与其他种族的人群进行比较。评估了毛发检查结果正常的健康泰国人。本研究共有 239 名受试者参加，其中 79 名男性，160 名女性。使用定量毛发镜分析在四个不同头皮部位分析毛发密度和直径。泰国人的毛发密度在顶点区域最高。四个不同头皮部位的毛发密度存在显著差异；只有顶点部位的毛发密度与枕部区域无显著差异。相比之下，不同部位的毛发直径没有显示出任何统计学上的显著差异。我们观察到随着年龄的增长，平均毛发密度降低，并且在 20 多岁和 60 多岁的参与者之间存在统计学差异，而毛发直径保持一致。将我们的结果与之前其他种族的研究进行比较，亚洲人的毛发密度普遍较低。总之，泰国人群的毛发密度在不同头皮部位存在差异。年龄是毛发密度下降的一个因素。与白种人和非裔人群相比，亚洲人的毛发密度较低。
