|Included papers||Excluded papers|
|Types of studies||Quantitative studies with some quantitative measures of association between pre-discharge variables and readmission of psychiatric patients||Qualitative studies, case reports and papers not including original data, such as editorials, letters to the Editor, commentaries, reviews and meta-analyses. Studies that were not published as full reports or whose full text was not available.|
|Language||Papers published in English, German, Spanish, Italian and French|
Studies examining adult populations, i.e., the mean/median age of at least 18 as criterion or - when it was not possible to have direct information on that - it clearly concerned an adult population.|
The study participants had to be originally admitted with a psychiatric diagnosis (for example, if diagnosed using the ICD-10 system, including all diagnoses that belong to the class F00–F99 (World Health Organization, 2011)) or for a psychiatric problem (assuming this criterion as satisfied if the hospital/unit was clearly a psychiatric hospital or inpatient psychiatric unit or the authors stated that the admission episode is an acute psychiatric one).
|Outcomes||Papers reporting only analyses on other kinds of outcomes, even if connected to readmission in inpatient care (i.e., related to time to readmission or cumulative Los or number/frequency of readmissions) - results on analyses of these outcomes in the included papers were disregarded as well-.|
|Other exclusion criteria||The baseline did not correspond to individual patient’s discharge from hospital; it was not clear whether there was a discharge at all, or the same time-period for admissions and readmissions was considered; lack of information on the direction of any association; exclusion of readmitted patients from analysis due to modelling strategy; model either inadequate or not described; not clearly reported time of follow-up (or differing across patients with analyses not taking such variability into account); inclusion of patients dead during the index-admission among the non-readmitted; only evaluating the (comparative) efficacy of a specific drug in a trial without other predictors of interest.|