Fig. 1: Flowchart of the study population.

3,828,791 patients received a first ICD-10 index primary diagnosis of a nonorganic psychotic disorder. 1,398,458 patients were excluded as there was not sufficient data available to impute aggregate ethnicity coefficients. This provided a final study population of 2,430,333, which included 24,941 individuals who developed an ICD-10 diagnosis of a non-organic psychotic disorder.