title: [Is Mapuche ethnicity a risk factor for hip fracture in aged?].
abstract: BACKGROUND
  Ethnic factors are involved in the risk for osteoporosis and hip fracture.
  
  
  OBJECTIVE
  To assess the effect of Mapuche ethnicity on the risk of hip fracture.
  
  
  METHODS
  A case control study. Cases were subjects over 55 years of age admitted, during one year, for hip fracture not associated to major trauma or tumors. Controls were randomly chosen from other hospital services and paired for age with cases. The magnitude of the association between ethnicity and hip fracture was expressed as odds ratio in a logistic regression model.
  
  
  RESULTS
  In the study period, 156 cases with hip fracture were admitted. The proportion of subjects with Mapuche origin was significantly lower among cases than controls (11.8 and 26.5% respectively, p < 0.001). In the logistic regression model, Mapuche ethnicity was associated with hip fracture with an odds radio of 0.14 (p = 0.03, 95% CI 0.03-0.8).
  
  
  CONCLUSIONS
  In this sample, Mapuche ethnicity is a protective factor for hip fracture.
authors.affiliation: Unidad de Endocrinología, Departamento de Medicina Interna, Universidad de La Frontera. finfin@surnet.cl
authors.forename: Jorge
authors.initials: J
authors.lastname: Sapunar
authors.forename: Paulina
authors.initials: P
authors.lastname: Bravo
authors.forename: Hermann
authors.initials: H
authors.lastname: Schneider
authors.forename: Marcela
authors.initials: M
authors.lastname: Jiménez
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D015519:Bone Density; D016022:Case-Control Studies; D002677:Chile / Q000208:ethnology; D005006:Ethnicity; D005260:Female; D006620:Hip Fractures / Q000208:ethnology* / Q000209:etiology; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012680:Sensitivity and Specificity