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DSM-IV-TR Diagnostic Criteria for Schizophrenia (Modified)a

A. Characteristic symptoms: patient must have 2 symptoms during a 1-month (active) phase (except as noted below) (only 1 symptom is required if delusions are bizarre or hallucinations are a voice commenting on one's behavior/thoughts or if 2 or more voices are conversing with each otherbc)
    1. Delusionsb
    2. Hallucinationsb
    3. Disorganized speech (frequent derailment, incoherence)b
    4. Grossly disorganizedb or catatonicb behavior
    5. Negative symptoms (affective flattening, alogia, and avolition)b
B. Social/occupational dysfunction: work, interpersonal relations, or self-care have markedly deterioratedb
C. Duration: continuous signs for 6 months with 1-month active-phase symptoms and may include prodromal or residual symptomsb
D. Exclude schizoaffective and mood D/Od with psychotic featurese
E. Exclude substance and general medical conditionb
F. Exclude preexisting pervasive developmental D/Ob