What is the main diagnostic distinction among schizophrenia, schizophreniform disorder, and brief psychotic disorder?

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The main diagnostic distinction among schizophrenia, schizophreniform disorder, and brief psychotic disorder is the length of time the symptoms persist. Schizophrenia requires a minimum of 6 months of persistent symptoms, while schizophreniform disorder requires at least 1 month but less than 6 months of persistent symptoms. Brief psychotic disorder requires symptoms that last for at least 1 day but less than 1 month. Age of onset, severity of symptoms, and number of symptoms are not necessarily distinguishing factors between these disorders. The presence of psychosis is a common feature of all three disorders.

What Is the Main Diagnostic Distinction Among Schizophrenia, Schizophreniform Disorder