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A. Characteristic symptoms: Two (or more) of the following, each present
for a significant portion of time during a 1-month period (or less if
successfully treated):
(1) delusions
(2) hallucinations
(3) disorganized speech (e.g., frequent derailment or incoherence)
(4) grossly disorganized or catatonic behavior
(5) negative symptoms, i.e., affective
flattening, alogia, or
avolition
Note: Only one Criterion A symptom is required if delusions are bizarre
or hallucinations consist of a voice keeping up a running commentary on the
person's behavior or thoughts, or two or more voices conversing with each
other.
B. Social/occupational dysfunction: For a significant portion of the time
since the onset of the disturbance, one or more major areas of functioning such
as work, interpersonal relations, or self-care are markedly below the level
achieved prior to the onset (or when the onset is in childhood or adolescence,
failure to achieve expected level of interpersonal, academic, or occupational
achievement).
C. Duration: Continuous signs of the disturbance persist for at least 6
months. This 6-month period must include at least 1 month of symptoms
(or less
if successfully treated) that meet Criterion A (i.e., active-phase symptoms) and
may include periods of prodromal or residual symptoms. During these prodromal or
residual periods, the signs of the disturbance may be manifested by only
negative symptoms or two or more symptoms listed in Criterion A present in an
attenuated form (e.g., odd beliefs, unusual perceptual experiences).
D. Schizoaffective and Mood Disorder exclusion: Schizoaffective Disorder
and Mood Disorder With Psychotic Features have been ruled out because either (1)
no Major Depressive, Manic, or
Mixed Episodes have occurred concurrently with
the active-phase symptoms; or (2) if mood episodes have occurred during
active-phase symptoms, their total duration has been brief relative to the
duration of the active and residual periods.
E. Substance/general medical condition exclusion: The disturbance is not
due to the direct physiological effects of a substance
(e.g., a drug of abuse, a
medication) or a general medical condition.
F. Relationship to a Pervasive Developmental
Disorder: If there is a
history of Autistic Disorder or another Pervasive Developmental Disorder, the
additional diagnosis of Schizophrenia is made only if prominent delusions or
hallucinations are also present for at least a month (or less if successfully
treated).
Classification of longitudinal course (can be applied only after at least
1 year has elapsed since the initial onset of active-phase symptoms):
Episodic With Interepisode Residual Symptoms (episodes are defined by the
reemergence of prominent psychotic symptoms); also specify if: With
Prominent Negative Symptoms
Episodic With No Interepisode Residual Symptoms
Continuous (prominent psychotic symptoms are present throughout the
period of observation); also specify if: With Prominent Negative
Symptoms
Single Episode In Partial Remission; also specify if: With
Prominent Negative Symptoms
Single Episode In Full Remission
Other or Unspecified Pattern
Reprinted with permission from the Diagnostic and Statistical Manual of Mental
Disorders, Fourth Edition, Text Revision. Copyright 2000 American Psychiatric Association
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