Diagnostic conversion from unipolar depression to bipolar disorder, schizophrenia, or schizoaffective disorder: A nationwide prospective 15‐year register study on 43 495 inpatients

Objective To examine temporal patterns and predictors for diagnostic conversion from unipolar depression (UD) to bipolar disorder (BD), schizophrenia, and schizoaffective disorder (SAD). Methods A prospective nationwide register‐based cohort (n = 43 495) of all first psychiatric hospitalizations due to UD during 1996‐2011 was followed up to 15 years. We used cumulative incidence function (CIF) analyses and the Fine‐Gray subdistribution model to...