Classification & Diagnosis of Phobias
- Created by: jg1234
- Created on: 08-03-16 21:25
Inter-Rater Reliability
- an experiment that is conducted using more than one researcher to increase the reliability of the findings - if all of the researchers get the same findings it suggests that the measure is reliable
Skyre et al
- asked 3 clinicians to assess 54 different patient interviews using the Structured Clinical Interview (SCD)
- found that there was high inter-rater agreement suggesting that this is a reliable source
Test-Retest Reliability
- conducting the same experiment more than once to see if the same results are collected again
Hiller et al
- used the Munich Diagnostic Checklist (MDC)
- found that there was a satisfactory to excellent diagnositc agreement in the test-retest study using the MDC scale
Evaluation
Picon et al - using the Portugese Social Phobia and Anxiety Inventory (SPAI)
- found that there was good test-retest reliability over a 14 day interval
Kendler et al - face-to-face and telephone interviews to assess individuals with phobias
- over a month interval there was a mean agreement of +.46 and over 8 years there was an agreement of +.36
- Kendler says that some of the low results may be due to the participants poor recall and it may be due to a difference in the decisions that were made by the interveiwer
IDA - Diagnosis By Computer
- the reliability of diagnosis may be increased by the use of computerised scales instead
Kobak et al - there is increased reliability as there is less opportunity for the administrator to influence the results given and people with social phobias may prefer to answer without another person there
Comorbidity
- this is an important issues for the validity of diagnosis
- comorbidity is the extent to which two phobis co-occur
Kendler et al - found that there is high levels of comorbidity between social phobias, animal phobias, anxiety and depression
- some conditions may not be seperate entities so the distinction category isn't clear
AO2
Eysenck - up to 66% of patients with one anxiety disorder are likely to be diagnosed with another
Vasey & Dadds - the treatment success of anxiety disorders was unrelated to the original diagnosis of the phobia - some treatments worked equally well
Concurrent Validity
- this looks at questionnaires and interviews used in diagnosis
- concurrent validity establishes the value of a new measure of phobic disorders by correlating it with an existing measure
Herbert et al - concurrent validity in Social Phobia and Anxiety Inventory (SPAI) by giving the test and various other measures to 23 social phobics
- the results showed that the measures correlated well
AO2
Mattick & Clarke - Social Phobia Scale (SPS) correlates well with other measures
Construct Validity
- this is used to assess questionnaires and interviews used to diagnose phobias
- it measures the extent a test for phobic disorders really does measures a target construct (symptom) of phobias
- to do this clinicains identify possible target behaviour we would expect in someone with a phobic disorder and see if people will score high on the test for phobic disorders and exhibit the target behaviour
AO2
- Social Phobia and Anxiety Inventory (SPAI) correlates well with behavioural measures of social phobias
- Beidel et al - the SPAI doesn't correlate well with the behaviours that are related to anxiety disorders
Implications of low reliability and/or validity
- in order to construct research on the effectiveness of treatments for phobic disroders researchers require a reliable and valid means of assessing the disorders
- the diagnosis and classifications of phobias are critical
IDA - Cultural Differences
- the cultural norms of 'normal functioning' and 'normal fears' are likely to affect the diagnosis of phobias
- judgements vary with respect to the culturally-relative disorders
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