Changes in diagnoses code.

*Among patients whose first SMI record is for other psychosis, those who subsequently received a diagnosis of bipolar disorder or schizophrenia are re-classified as such. Among patients whose first SMI record indicates inclusion on an SMI register, those who subsequently received a diagnosis of schizophrenia, bipolar disorder or other psychosis are re-classified as such. Patients whose first record is for schizophrenia are re-classified as bipolar disorder if they subsequently received a bipolar disorder diagnosis and vice-versa (since the more recent record may be seen as the most accurate diagnosis).