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A twin study compares the concordance rate of identical twins to that of fraternal twins. This can help suggest whether a disease or a certain trait has a genetic cause. [3] Controversial uses of twin data have looked at concordance rates for homosexuality and intelligence. Other studies have involved looking at the genetic and environmental ...
Additionally, the onset of schizophrenia, according to the Dutch national register, used four of their largest immigrant groups, which included people from Turkey, Morocco, the Netherlands Antilles, and Surinam, to discover that rates of schizophrenia from those living in the Netherlands from these countries were higher than the native-born ...
The question of how schizophrenia could be primarily genetically influenced, given that people with schizophrenia have lower fertility rates, is a paradox. It is expected that genetic variants that increase the risk of schizophrenia would be selected against, due to their negative effects on reproductive fitness .
The result means that, of these, 21 will not be identified as having schizophrenia by use of FRS (43% of 48). Then, of the 52 people really without schizophrenia, 10 may be incorrectly diagnosed with schizophrenia by the FRS. Diagnosis of schizophrenia from other types of psychosis Sensitivity 58.0 (50.3, 65.3) Specificity 74.7 (85.2, 82.3)
Another study investigated the rates of schizophrenia of adoptees: adoptees with a genetic history of schizophrenia that were adopted by non-schizophrenic parents were seen to be diagnosed with schizophrenia at higher rates than adoptees without a biological history of schizophrenia but raised with adoptive parents diagnosed with schizophrenia. [1]
Schizophrenia is diagnosed 1.4 times more frequently in males than females, and typically appears earlier in men [7] —the peak ages of onset schizophrenia are 20–28 years for males and 26–32 years for females. [10] Early Onset schizophrenia in childhood, before the age of 13 can sometimes occur.
The following diagnostic systems and rating scales are used in psychiatry and clinical psychology.This list is by no means exhaustive or complete. For instance, in the category of depression, there are over two dozen depression rating scales that have been developed in the past eighty years.
The Schedule for Affective Disorders and Schizophrenia (SADS) [note 1] is a collection of psychiatric diagnostic criteria and symptom rating scales originally published in 1978. [1] It is organized as a semi-structured diagnostic interview.
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