According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM 5), the lifetime prevalence of schizophrenia is approximately 0.3%-0.7%.
- Impairment in one of the major areas of functioning for a significant period of time since the onset of the disturbance: Work, interpersonal relations, or self-care.
Schizophrenia is characterized by delusions, hallucinations, disorganized speech and behavior, and other symptoms that cause social or occupational dysfunction.
The DSM-5 has added the word, “spectrum” to the title. The same basic diagnoses are still available in the DSM-5. Some symptom criteria were changed to make diagnosis more accurate and precise.
Perhaps the most substantial change to this category of disorders is the elimination of subtypes (paranoid, disorganized, catatonic, undifferentiated, and residual). The rationale for doing away with these subtypes is they are not stable conditions and have not afforded significant clinical utility nor scientific validity and reliability.
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Progress in developing effective interventions to ameliorate these problems has been slowed by the absence of reliable and valid measures that are suitable for use in clinical trials.
Bellack, Alan S., et al. "Assessment of community functioning in people with schizophrenia and other severe mental illnesses: a white paper based on an NIMH-sponsored workshop." Schizophrenia bulletin 33.3 (2006): 805-822.
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