title: Phototrichogram analysis of normal scalp hair characteristics with aging.
abstract: BACKGROUND
  Phototrichogram analysis of normal scalp hair characteristics in Asian populations is not well characterized.
  
  
  OBJECTIVE
  To investigate the normal hair characteristics of South Koreans using a phototrichogram.
  
  
  METHODS
  We enrolled 674 males and 683 females between the ages of 10 and 69. Hair density, thickness and the white hair percentage were measured via phototrichogram. Six scalp sites, including front, top, the peak between top and back, back, and the right and left sides were targeted.
  
  
  RESULTS
  The mean hair density, hair thickness, and the white hair percentages were not significantly different between genders at any scalp site. The mean hair density and thickness were significantly different according to scalp sites. Hair density declined with age, especially at the peak between the top and back. Males and females showed different patterns of aging in hair density. Hair thickness changed little with age. Mean hair thickness generally tended to increase until the 20s, reach a plateau between the 20s and 50s, and decrease after the 50s. The mean white hair percentages were 1.84 ± 4.24% in males and 1.66 ± 4.21% in females. The mean white hair percentages were significantly increased in subjects over 40 years of age.
  
  
  CONCLUSIONS
  We described the normal characteristics and aging patterns of scalp hair in a Korean population.
authors.affiliation: St. Paul's Hospital, College of Medicine, 620-56, Jeonnong-dong, Dongdaemoon-ku, Seoul, Korea.
authors.forename: Jung Eun
authors.initials: JE
authors.lastname: Kim
authors.affiliation: St. Paul's Hospital, College of Medicine, 620-56, Jeonnong-dong, Dongdaemoon-ku, Seoul, Korea.
authors.forename: Joo Hyun
authors.initials: JH
authors.lastname: Lee
authors.affiliation: St. Paul's Hospital, College of Medicine, 620-56, Jeonnong-dong, Dongdaemoon-ku, Seoul, Korea.
authors.forename: Kwang Hyun
authors.initials: KH
authors.lastname: Choi
authors.affiliation: Wonju College of Medicine, Wonju, Korea.
authors.forename: Won-Soo
authors.initials: WS
authors.lastname: Lee
authors.affiliation: College of Medicine, Incheon, Korea.
authors.forename: Gwang Seong
authors.initials: GS
authors.lastname: Choi
authors.affiliation: Seoul College of Medicine, Seoul, Korea.
authors.forename: Oh Sang
authors.initials: OS
authors.lastname: Kwon
authors.affiliation: School of Medicine, Busan, Korea.
authors.forename: Moon Bum
authors.initials: MB
authors.lastname: Kim
authors.affiliation: Seoul Bundang Hospital, Seongnam, Korea.
authors.forename: Chang-Hun
authors.initials: CH
authors.lastname: Huh
authors.affiliation: Chonbuk Medical School, Jeonju, Korea.
authors.forename: Chull-Wan
authors.initials: CW
authors.lastname: Ihm
authors.affiliation: College of Medicine, Korea University, Seoul, Korea.
authors.forename: Young Chul
authors.initials: YC
authors.lastname: Kye
authors.affiliation: Myongji Hospital, Goyang, Korea.
authors.forename: Byung In
authors.initials: BI
authors.lastname: Ro
authors.affiliation: College of Medicine, Kyunghee University, Seoul, Korea.
authors.forename: Woo-Young
authors.initials: WY
authors.lastname: Sim
authors.affiliation: Kyungpook School of Medicine, Daegu, Korea.
authors.forename: Do Won
authors.initials: DW
authors.lastname: Kim
authors.affiliation: St. Paul's Hospital, College of Medicine, 620-56, Jeonnong-dong, Dongdaemoon-ku, Seoul, Korea.
authors.forename: Hyung Ok
authors.initials: HO
authors.lastname: Kim
authors.affiliation: St. Paul's Hospital, College of Medicine, 620-56, Jeonnong-dong, Dongdaemoon-ku, Seoul, Korea.
authors.forename: Hoon
authors.initials: H
authors.lastname: Kang
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D044466:Asian People; D002648:Child; D005260:Female; D006197:Hair / Q000033:anatomy & histology* / Q000502:physiology; D006200:Hair Color; D006801:Humans; D008297:Male; D008875:Middle Aged; D010781:Photography; D056910:Republic of Korea; D012535:Scalp / Q000033:anatomy & histology; D015595:Skin Aging / Q000502:physiology*; D055815:Young Adult
keywords: Aging; Hair characteristics; Hair density; Hair thickness; Phototrichogram; White hair