title: [Sexual dimorphism in skin, eye and hair color and the presence of freckles in Chilean teenagers from two socioeconomic strata].
abstract: BACKGROUND
  The risk of skin cancer is correlated with skin colour. Pigmentation protects against the effects of UV radiation.
  
  
  OBJECTIVE
  To study skin, eyes and hair colour in Chilean teenagers.
  
  
  METHODS
  The constitutive skin, hair and eyes colour and the presence of freckles was studied in 716 teenagers (416 females) of a low socio economical level and in 307 teenagers (155 females) of a high socio economical level.
  
  
  RESULTS
  The proportion of foreign surnames was higher in the high stratum and we only found aboriginal surnames in the low stratum. The females of the lower stratum presented lighter skin than males. This difference was not observed in the higher stratum. We did not find significant differences in the eye colour between sexes, however, adolescents from the high stratum presented lighter eye colour. Females had lighter hair colour than males in both strata, also, we found lighter hair colour in the high stratum. We did not find significant differences in the presence of freckles between strata, but, the proportion of females with freckles was higher than that of males in both strata.
  
  
  CONCLUSIONS
  Our results may identify different groups of people, within the Chilean population, with different susceptibility to the effects of ultraviolet radiation.
mesh_terms: D000293:Adolescent; D002677:Chile / Q000453:epidemiology; D005260:Female; D006200:Hair Color; D006801:Humans; D008297:Male; D008548:Melanosis / Q000453:epidemiology*; D012307:Risk Factors; D012727:Sex Characteristics; D012878:Skin Neoplasms / Q000209:etiology; D012880:Skin Pigmentation; D012923:Social Class; D014466:Ultraviolet Rays / Q000009:adverse effects
vernacular_title: Dimorfismo sexual en la pigmentación de la piel, color de ojos y pelo y presencia de pecas en adolescentes chilenos en dos estratos socioeconómicos.