Inter-rate reliability as low as 11%. Diagnosis in inconsitant. DSM unreliable in accuratley and consistantly diagnosis schizophrenia
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Positive symptoms more useful for diagnosis than negative symptoms
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Gave description of patient to 134 US and 194 British psychiatrists. 69% of US psychiatrists diagnosed schizophrenia, but only 2% British psychiatrists gave same diagnosis
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Concerns questions about what schizophrenia really is
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Able to identify one single cause
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Able to prescribe a suitable course of treatment and be able to predict the course of illness
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Has distinct symptoms
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Developed a first rank system that he believed distinguished schizophrenia from other disorders.
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Found people with DID have more schizophrenia symptoms than those with schizophrenia. Raises issues with comorbidity so hard to tret as diagnosis is unreliable