Classification and Diagnosis of Schizophrenia

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Delusions, Experiences of Control, Disordered thinking, Hallucinations
Positive Symptoms (DSM)
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Affective flattening, alogia, avolition
Negative Symptoms (DSM)
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Whether two independent assessors give similar diagnoses.
Inter-rater reliability
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Whether tests used to deliver these diagnosis are consistent over time
Test-retest reliability
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Refers to the extent that two or more conditions co-occur.
Comorbidity
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Estimates that comorbid depression occurs in 50% of schizophrenia patients, and 47% also have a lifetime diagnosis of comorbid substance abuse.
Buckley et al (2009)
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Found inter-rater reliability correlations in the diagnosis of Sz as low as +11.
Whaley (2001)
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Although the inter-rater reliability for both DSM and ICD was above +50, Sz was more frequently diagnosed according to ICD-10 than DSM-IV
Cheniaux et al (2009)
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Reported that the incidence rate for Sz was 8 times higher for African-Caribbean groups than for white groups.
Harrison et al (1997)
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Point out that people with dissociative identity disorder (DID) actually have more schizophrenic symptoms than people diagnosed with Sz.
Ellason and Ross (1995)
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On being sane in insane places
Rosenhan, (1973)
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Gave 134 US and 194 British psychiatrists a description of a patient. 69% of the US psychiatrists diagnosed Sz, but only 2% of the British psychiatrists gave the same diagnosis.
Copeland (1971)
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Card 2

Front

Affective flattening, alogia, avolition

Back

Negative Symptoms (DSM)

Card 3

Front

Whether two independent assessors give similar diagnoses.

Back

Preview of the front of card 3

Card 4

Front

Whether tests used to deliver these diagnosis are consistent over time

Back

Preview of the front of card 4

Card 5

Front

Refers to the extent that two or more conditions co-occur.

Back

Preview of the front of card 5
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