title: Scalp seborrheic dermatitis: prevalence and associated factors in male adolescents.
abstract: BACKGROUND
  The prevalence of seborrheic dermatitis (SD) in the general population is variable in the literature. Factors associated with SD are not well understood.
  
  
  OBJECTIVE
  To verify the prevalence of scalp SD in a selected survey of male adolescents on mandatory military service and to find possible associated factors (skin color, socioeconomic level, triceps skin fold, acne, and tobacco consumption).
  
  
  METHODS
  This cross-sectional study included 18-year-old male adolescents on compulsory military service in a southern Brazilian city. Scalp SD was considered as erythema and scaling in any part of the scalp. Skin color, socioeconomic level, triceps skin fold, acne, and tabagism comprised the independent variables studied in our population.
  
  
  RESULTS
  A total of 2201 adolescents entered the study. The global prevalence of scalp SD was 11%. White skin [adjusted prevalence ratio (PR) 1.42; 95% CI 1.06-1.92; P = 0.02] and triceps skin fold >19.5 mm (adjusted PR 1.56; 95% CI 1.12-2.18; P = 0.009) were significantly associated with scalp SD. The other variables were not associated with the outcome.
  
  
  CONCLUSIONS
  Prevalence of scalp SD in our survey of male adolescents was 11%. The occurrence of scalp SD was associated with white skin and a higher body fat content.
authors.affiliation: Faculty of Medicine, University of Santa Cruz do Sul-UNISC, Santa Cruz Hospital, School of Medicine, Santa Cruz do Sul, RS, Brazil. julianobreunig@gmail.com
authors.forename: Juliano de Avelar
authors.initials: Jde A
authors.lastname: Breunig
authors.forename: Hiram Larangeira
authors.initials: HL
authors.lastname: de Almeida
authors.forename: Rodrigo Pereira
authors.initials: RP
authors.lastname: Duquia
authors.forename: Paulo Ricardo Martins
authors.initials: PR
authors.lastname: Souza
authors.forename: Henrique Luiz
authors.initials: HL
authors.lastname: Staub
mesh_terms: D000152:Acne Vulgaris / Q000453:epidemiology; D000293:Adolescent; D001938:Brazil / Q000453:epidemiology; D003430:Cross-Sectional Studies; D012628:Dermatitis, Seborrheic / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008889:Military Personnel / Q000706:statistics & numerical data; D015995:Prevalence; D012536:Scalp Dermatoses / Q000453:epidemiology*; D044465:White People / Q000706:statistics & numerical data