title: [Multi-centre study of the prevalence of infection from HIV and associated factors in Spanish prisons].
abstract: OBJECTIVE
  To determine the prevalence and associated factors of HIV infection amongst inmates in Spain.
  
  
  METHODS
  Observational and transversal study (June 2008). For 62,000 inmates an "n" of 364 was determined (5% variability, error correction α 5% and 10% missing). 18 prisons were randomly selected and 21 inmates/prison. Frequency measurement: prevalence. Magnitude of the association: odds ratio of prevalence (ORP) with 95%. Statistical significance p<0.05.
  
  
  RESULTS
  371 prisoners were studied (91.6% male, 66.9% ≤ 40 years, 60.6% Spanish, 23.5% IDU and 71.2% incarcerated <5 years). HIV prevalence was 10.8% (CI: 7.5 to 14). 85% were co-infected with HCV, 12.5% with HBV and HCV and 63.2% with M. tuberculosis. This represents a proportion to the prison population of 9.2%, 1.3% and 6.7% respectively. HIV infection was associated with: a) > 40 years (p <0.01), b) imprisoned> 5 years (p <0.001), c) non-Arab (p <0.01), d) Spanish nationality (p <0.001), e) IDUs (p <0.001), f) co-infected with HCV (p <0.001), and g) co-infected with HBV (p <0.001]. Multivariate analysis confirmed the association: a) ≥ 40 years [OR = 2.66 (CI : 1.16-6.07), b) IDU [OR = 28.08 (IC-9.61-81.99), c) infected with HCV [OR = 6.96 (CI :1.90-25.39)], and d) infected with HBV [OR = 13.52 (CI = 1.76-103.82).
  
  
  CONCLUSIONS
  The prevalence of HIV infection among prisoners in Spain is 10.8%. Those that are infected are usually IDUs and over 40 years. 85% are co-infected with HCV and 12.5% with HBV and HCV.
authors.affiliation: Servicios Sanitarios, Centro Penitenciario de Hombres de Barcelona, Barcelona, España. andres.marco.m@gmail.com
authors.forename: A
authors.initials: A
authors.lastname: Marco
authors.forename: P
authors.initials: P
authors.lastname: Saiz de la Hoya
authors.forename: J
authors.initials: J
authors.lastname: García-Guerrero
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D015658:HIV Infections / Q000453:epidemiology*; D006801:Humans; D008297:Male; D015995:Prevalence; D011330:Prisons; D012307:Risk Factors; D013030:Spain