title: Psychiatric rehospitalization among elderly persons in the United States.
abstract: OBJECTIVE
  This study examined predictors of psychiatric rehospitalization among elderly persons.
  
  
  METHODS
  Readmission within six months of an index hospitalization was modeled by using Medicare data on all hospitalizations with a primary psychiatric diagnosis in the first half of 2002 (N=41,839). Data were linked with state and community-level information from the U.S. census.
  
  
  RESULTS
  Twenty-two percent of beneficiaries were rehospitalized for psychiatric reasons within six months of discharge. After the analyses adjusted for sociodemographic factors, readmission was most likely among persons with a primary diagnosis of schizophrenia (hazard ratio [HR]=2.63), followed by bipolar disorder (HR=2.51), depression (HR=1.75), and substance abuse (HR=1.38) (reference group was "other" psychiatric conditions). A baseline hospital stay of five or more days for an affective disorder was associated with a reduced readmission hazard (HR=.68, relative to shorter stays), yet the opposite was true for a nonaffective disorder (HR=1.26). For persons with nonaffective disorders, an elevated hazard of readmission was associated with comorbid alcohol dependence (HR=1.32), panic disorder (HR=1.76), borderline personality disorder (HR=2.33), and drug dependence (HR=1.17). However, for persons with affective disorders, having a personality disorder other than borderline personality disorder or dependent personality disorder (HR=1.27) and having an "other" anxiety disorder (HR=1.15) were significantly associated with an increased risk of rehospitalization. Obsessive-compulsive disorder increased the readmission hazard in both groups.
  
  
  CONCLUSIONS
  Readmission risk factors may differ for affective disorders and nonaffective disorders. Very short hospitalizations were associated with increased risk of rehospitalization among persons with an affective disorder, which underscores the need for adequate stabilization of this group of patients during hospitalization. Results also highlight the specific types of comorbidities associated most strongly with rehospitalization risk.
authors.affiliation: School of Social Work, Rutgers University, 536 George St., New Brunswick, NJ 08901-1167, USA. jdprince@rci.rutgers.edu
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Prince
authors.forename: Ayse
authors.initials: A
authors.lastname: Akincigil
authors.forename: Ece
authors.initials: E
authors.lastname: Kalay
authors.forename: James T
authors.initials: JT
authors.lastname: Walkup
authors.forename: Donald R
authors.initials: DR
authors.lastname: Hoover
authors.forename: Judith
authors.initials: J
authors.lastname: Lucas
authors.forename: John
authors.initials: J
authors.lastname: Bowblis
authors.forename: Stephen
authors.initials: S
authors.lastname: Crystal