title: Predictive model for emergency hospital admission and 6-month readmission.
abstract: OBJECTIVE
  To study risk factors for and likelihood of unplanned hospital admission and readmission in persons aged >65 years in Catalonia, Spain.
  
  
  METHODS
  Retrospective cohort study.
  
  
  METHODS
  We used data from clinical records of the primary care centers, pharmacy database, and hospital discharge records for persons aged >65 years registered in primary care centers of referral hospitals in the Baix Llobregat healthcare area. Unplanned hospital admission was defined as any unscheduled hospitalization in 2008; unplanned readmission was defined as any unscheduled admission occurring within 6 months after discharge date of index admission. Logistic regression analysis was used to identify predictors of unplanned hospital admission and readmission.
  
  
  RESULTS
  The population included 28,430 individuals. Among them, 2103 (7%) experienced an unplanned admission and 365 (1.3%) an unplanned readmission. The readmission rate for the admitted population was 18.7%. The strongest predictive factor of unplanned admission was >2 admissions in the previous 2 years (odds ratio [OR] 24.9, 95% confidence interval [CI] 16.0-38.7 for 2007; OR 15.6, 95% CI 8.6-28.0 for 2006). Factors associated with unplanned readmission were aged >80 years (OR 4.6, 95% CI 3.1-7.1) and >2 admissions during the previous year (OR 20.4, 95% CI 14.1-29.5). The area under the receiver operating characteristics curve was 0.78 for unplanned admission and 0.85 for unplanned readmission in the development sample and 0.76 and 0.81, respectively, in the validation sample.
  
  
  CONCLUSIONS
  Aged persons and those who used more hospital services in previous years had a higher probability of hospital admission and readmission.
authors: Agencia d'Informacio, Avaluacio i Qualitat en Salut, AIAQS, Carrer de Roc Boronat, 81-95 (2a planta), 08005 Barcelona, Spain. slopeza@aatrm.catsalut.cat
authors: Sílvia
authors: S
authors: López-Aguilà
authors: Joan Carles
authors: JC
authors: Contel
authors: Josep
authors: J
authors: Farré
authors: José Luis
authors: JL
authors: Campuzano
authors: Luis
authors: L
authors: Rajmil
mesh_terms: D000367:Age Factors; D000368:Aged; D000375:Aging; D016208:Databases, Factual; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D017146:Models, Organizational; D010359:Patient Readmission / Q000706:statistics & numerical data*; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D013030:Spain