title: Psychiatric Rehospitalization: Development of a Person-Level Indicator for Care Planning and Quality Assurance.
abstract: OBJECTIVE
  Rehospitalization affects quality of life and health system efficiency. Although this outcome is a common quality indicator, there are few applications for linking evaluation to risk mitigation at the person level. This study examined risk factors for rehospitalization to develop an application for supporting care planning based on the interRAI Mental Health (MH), a commonly available assessment system.
  
  
  METHODS
  A retrospective analysis was performed of 53,538 psychiatric inpatients assessed with the interRAI MH in Ontario, Canada, between January 2010 and May 2014. The interRAI MH is a clinical system for assessing demographic variables, service utilization, functional status, and clinical needs. Logistic regression models and survival analysis were used to develop the Rehospitalization Clinical Assessment Protocol by predicting 90-day rehospitalization to any inpatient mental health bed.
  
  
  RESULTS
  Variables found to significantly predict rehospitalization included 6 or more lifetime hospitalizations (odds ratio [OR] = 1.40), positive symptoms of psychosis (OR = 1.23), a secondary substance use disorder (OR = 1.13), and being at risk of harm to self (OR = 1.11). Using these variables, the Rehospitalization Clinical Assessment Protocol was derived whereby those at level 2 (highest) were 74% more likely to be rehospitalized within 90 days than those at level 0. By 1-year postdischarge, 30% at level 2 and 18% at level 0 were rehospitalized.
  
  
  CONCLUSIONS
  The Rehospitalization Clinical Assessment Protocol is an application supporting care planning for targeting risk of rehospitalization whenever a person is assessed with the interRAI MH. Further exploration is needed to understand how the use of this Clinical Assessment Protocol, service processes, and health system structures further mediate or moderate psychiatric rehospitalization risk.
authors.affiliation: School of Public Health and Health Systems, University of Waterloo, Waterloo, Ontario (Drs Perlman and Hirdes); Women's College Research Institute, Women's College Hospital, Toronto; and Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada (Dr Vigod).
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Perlman
authors.affiliation: School of Public Health and Health Systems, University of Waterloo, Waterloo, Ontario (Drs Perlman and Hirdes); Women's College Research Institute, Women's College Hospital, Toronto; and Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada (Dr Vigod).
authors.forename: John P
authors.initials: JP
authors.lastname: Hirdes
authors.affiliation: School of Public Health and Health Systems, University of Waterloo, Waterloo, Ontario (Drs Perlman and Hirdes); Women's College Research Institute, Women's College Hospital, Toronto; and Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada (Dr Vigod).
authors.forename: Simone
authors.initials: S
authors.lastname: Vigod