title: Prevalence of male pattern hair loss in 18-49 year old men.
abstract: BACKGROUND
  Previous studies investigating the prevalence of male pattern hair loss (MPHL) typically used biased samples of men recruited from clinical populations which may limit generalizability of findings to broader populations.
  
  
  OBJECTIVE
  To obtain an updated and improved estimate of the occurrence of MPHL in healthy men residing in the community.
  
  
  METHODS
  Community-based sample of healthy men aged 18-49 years participated in a study investigating the effects of MPHL. Participants completed a brief questionnaire self reporting degree of hair loss, general health-related quality of life (HRQL) and hair-loss-specific measures. A trained observer also rated each participant using standardized classification for MPHL.
  
  
  RESULTS
  The proportion of men with moderate to extensive hair loss (type III or greater) was 42%. The proportion of men with moderate to extensive hair loss increased with increasing age, ranging from 16% for men 18-29 years of age to 53% of men 40-49. Twelve percent of the men were classified as having predominantly frontal baldness (type A variants).
  
  
  CONCLUSIONS
  MPHL, especially frontal baldness, may be more common than previously reported.
authors.affiliation: Department of Epidemiology, Merck Research Laboratories, West Point, PA 19486, USA.
authors.forename: T
authors.initials: T
authors.lastname: Rhodes
authors.forename: C J
authors.initials: CJ
authors.lastname: Girman
authors.forename: R C
authors.initials: RC
authors.lastname: Savin
authors.forename: K D
authors.initials: KD
authors.lastname: Kaufman
authors.forename: S
authors.initials: S
authors.lastname: Guo
authors.forename: F R
authors.initials: FR
authors.lastname: Lilly
authors.forename: R M
authors.initials: RM
authors.lastname: Siervogel
authors.forename: W C
authors.initials: WC
authors.lastname: Chumlea
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000505:Alopecia / Q000145:classification / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009820:Ohio / Q000453:epidemiology; D011788:Quality of Life