Page 21 - Read Online

Guo et al. The distribution of hair in Chinese

INTRODUCTION 3 × n 3 + 4 × n 4 + 5 × n 5 .
Follicular unit transplantation (FUT) and follicular unit As the vertex and temporal regions of most AGA
extraction (FUE) have become two preferred methods patients had no hair, these regions had no statistical
in hair transplantation surgery due to their aesthetic meaning. Thus, the photography and statistical
and natural postoperative appearance, and high methods were only applied to the occipital region in this
survival rate. FUT and FUE achieve their cosmetic and group [Figure 2]. The statistical data were processed
modification effects by the redistribution of existing in the same way as in the healthy group.
hair rather than by increasing the absolute number
of hairs. Thus, no matter which surgery method to Statistical analysis
choose, patients will require detailed evaluation in
multiple aspects, including the area of donor site to SPSS 13.0 software was used for statistical analysis
excise or extract [1,2] . Western scholars have conducted of the data. The measurement data were expressed
detailed research on the hair distribution of whites as mean ± standard deviation. Comparisons between
and Africans [3-5] . These studies have shown that the two groups were performed using independent-
hair density of Asians is lower than that of whites and samples t-tests. Comparisons among multiple groups,
Africans. However, due to geographical and ethnic such as homogeneity of variance, were performed
differences leading to disparities in hair distribution using one-way analysis of variance (ANOVA) and
among Asians, it is necessary to investigate the Bonferroni pairwise comparison. Welch’s approximate
hair distribution in Han Chinese. This paper aims to
explore the normal hair distribution characteristics of
Han Chinese, in order to facilitate clinical practice.

METHODS

Research subjects
A total of 146 healthy volunteers were Han Chinese
residents aged 20-70 years. None had ever received
hair coloring, perming, or other treatments. The
volunteers and their relatives had no hair diseases,
such as androgenetic alopecia, alopecia areata, or
hirsutism. Another 41 patients with androgenetic
alopecia (AGA) were selected for comparative
analysis. All volunteers were informed of the
objectives and specific methods of the study, and all 2
gave informed consent. Figure 1: Area measured at 1 cm . The FU density in the occipital
2
region of healthy patient was 95 units/cm . FU: follicular unit
Experimental method
The vertex region (the intersection between the
preauricular line connecting the left and right ears,
and the line connecting the glabella and external
occipital protuberance), temporal region (2 cm above
the preauricular line for both ears), and occipital region
(centered on the external occipital protuberance)
in the volunteers were selected as the observation
sites. Close-up photographs were taken of 2.5 cm ×
1.5 cm areas within the observation regions after the
hair within the area was trimmed. Photoshop CS5
was used to read the images and count the number
of follicular unit (FU) types (n 1 , n 2 , n 3 , n 4 , and n 5 )
comprising of 1, 2, 3, 4 and 5 hairs, respectively,
2
within 1 cm of the photographed region [Figure 1].
The following two formulas were use to calculate FU 2
2
density and hair density: FU density (hairs/cm ) = n 1 + Figure 2: Area measured at 1 cm . The FU density in the occipital
2
region of AGA patient was 86 units/cm . AGA: androgenetic
2
n 2 + n 3 + n 4 + n 5 ; Hair density (hairs/cm ) = n 1 + 2 × n 2 + alopecia; FU: follicular unit
Plastic and Aesthetic Research ¦ Volume 4 ¦ September 28, 2017 151