schiz - reliability and validity
what is the DSM-5 and ICD-10
What doctors use to diagnose patients with mental disorders, to be diagnosed with schiz patients need to display 2 or more symptoms for 6 months
what does diagnostic reliability mean
when a diagnosis must be consistent
what is validifty in diagnosis
how accurate the diagnosis is
what do reasearchers use to measure reliability
inter rater reliability which is measures by a kappa score.
what are the two threats for reliability
culture bias + co-morbidity
what is culture bias in diagnoses
doctores rely on social norms of their own culture o decide wethere a patients symptom matches schiz, this means they are more likely to diagnose schiz to patients from other cultures meaning it lacks reliability
whats a study for culture bias in diagnosis
copeland- gave 134 US and 194 British doctores a description of a patient. 69% US doctors diagnoses schiz, 2% british doctors gave the same diagnosis
what are the two threats for validity
symptom overlap, gender bias
what is gender bias in validity
doctors display beta or alpha bias when diagnosing a patient, in 1980's men have been diagnoses which schiz more than women
whats a study for gender bias
loring and powells study- they gave male and female doctors identical descriptions of a patients symptom and varied the patients gender. female patient 20% diagnosed as schiz, male patients 56% diagnosed as schiz. Alpha bias displayed
what is comorbidity
when two or more ilnesses occur together in the same person
what is a study for comorbidity
buckley et al (2009) found that patients with schiz also had substance abuse (47%), anxiety (15%) and depression (50%)
what is symptom overlap
when symptoms of schiz are found in other disorders such as depression and bipolar
what is a study for symptom overlap
ellason and ross- compared patients who have dissociative identify disorder and schiz patients. Found that patients with DID showed more schiz symptoms than schiz patients