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):
Disorganized speech (e.g., frequent derailment or incoherence)
disorganized or catatonic behavior
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