Identification of factors associated with hospitalization in an outpatient population with mental health conditions: a case-control study.

Introduction: Addressing relevant determinants for preserved person-centered rehabilitation in mental health is still a major challenge. Little research focuses on factors associated with psychiatric hospitalization in exclusive outpatient settings. Some variables have been identified, but evidence across studies is inconsistent. This study aimed to identify and confirm factors associated with hospitalization in a specific outpatient population. Methods: A retrospective monocentric case-control study with 617 adult outpatients (216 cases and 401 controls) from a French community-based care facility was conducted. Participants had an index outpatient consultation between June 2021 and February 2023. All cases, who were patients with a psychiatric hospitalization from the day after the index outpatient consultation and up to 1 year later, have been included. Controls have been randomly selected from the same facility and did not experience a psychiatric hospitalization in the 12 months following the index outpatient consultation. Data collection was performed from electronic medical records. Sociodemographic, psychiatric diagnosis, historical issues, lifestyle, and follow-up-related variables were collected retrospectively. Uni- and bivariate analyses were performed, followed by a multivariable logistic regression. Results: Visit to a psychiatric emergency within a year (adjusted odds ratio (aOR): 13.02, 95% confidence interval (CI): 7.32-23.97), drug treatment discontinuation within a year (aOR: 6.43, 95% CI: 3.52-12.03), history of mental healthcare without consent (aOR: 5.48, 95% CI: 3.10-10.06), medical follow-up discontinuation within a year (aOR: 3.17, 95% CI: 1.70-5.95), history of attempted suicide (aOR: 2.50, 95% CI: 1.48-4.30) and unskilled job (aOR: 0.26, 95% CI: 0.10-0.65) are the independent variables found associated with hospitalization for followed up outpatients. Conclusions: Public health policies and tools at the local and national levels should be adapted to target the identified individual determinants in order to prevent outpatients from being hospitalized.