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Unit 5: Clinical Psychology
5.1 Diagnosing Mental Disorders
5.1.3 Reliability and Validity in Diagnosis
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What does reliability in the context of diagnosing mental disorders refer to?
Consistency and repeatability
Inter-rater reliability is measured using Cohen's
Kappa
What measure is used for test-retest reliability?
Correlation coefficient
Two psychologists independently diagnosing Jane with Generalized Anxiety Disorder (GAD) demonstrates
inter-rater reliability
.
Validity in diagnosis refers to the extent a tool measures what it is intended to
measure
What does content validity ensure in diagnostic criteria?
All relevant aspects
Match the type of validity with its example:
Content Validity ↔️ DSM-5 criteria for Major Depressive Disorder
Construct Validity ↔️ Beck Depression Inventory (BDI)
Criterion Validity ↔️ Social anxiety correlates with behavior
The Beck Depression Inventory (BDI) measures the underlying psychological constructs of depression, demonstrating
construct validity
.
Clinician bias is a factor that can negatively affect both reliability and
validity
Factors affecting reliability and validity in diagnosis include clinician bias and diagnostic criteria
clarity
Clinician bias reduces inter-rater reliability but affects
criterion validity
Diagnostic criteria clarity improves inter-rater reliability and enhances content
validity
.
Patient factors affect test-retest reliability but impact
construct validity
Cultural and social influences can influence inter-rater reliability and affect criterion
validity
.
Reliability in diagnosing mental disorders refers to the consistency and repeatability of diagnostic
decisions
.
Match the type of reliability with its meaning and measure:
Inter-rater Reliability ↔️ Consistency between two or more clinicians |
κ
\kappa
κ
or
ICC
\text{ICC}
ICC
Test-retest Reliability ↔️ Consistency in diagnosis over time by the same clinician |
r
r
r
Two psychologists independently diagnosing Jane with GAD based on DSM-5 criteria demonstrate inter-rater
reliability
.
Test-retest reliability is measured using a
correlation coefficient
.
Validity in diagnosing mental disorders refers to the accuracy with which a diagnostic tool measures what it is intended to
measure
.
What are the two main types of reliability used in diagnosing mental disorders?
Inter-rater and test-retest
What does test-retest reliability measure?
Consistency over time
Validity in diagnosis refers to the
accuracy
of measuring what it is intended to measure.
Match the type of validity with its meaning:
Content Validity ↔️ Diagnostic criteria cover all relevant aspects
Construct Validity ↔️ Tool measures underlying psychological constructs
Criterion Validity ↔️ Outcomes correlate with real-world behaviors
Content validity ensures that diagnostic criteria cover all relevant aspects of the
disorder
Construct validity measures the tool's
ability
to correlate with other measures of the same construct.
Criterion validity checks if diagnostic outcomes correlate with real-world
behaviors
Why does the DSM-5 criteria for Major Depressive Disorder have good content validity?
Covers various aspects
The DSM-5 criteria for Major Depressive Disorder have good content validity because they cover aspects like mood and
motivation
What are some factors that can affect reliability and validity in diagnosis?
Clinician bias, patient factors
Clinician bias reduces inter-rater reliability and affects
criterion validity
.
How does diagnostic criteria clarity improve reliability?
Reduces variability
Cultural and social influences can affect inter-rater reliability and
criterion
validity.
What is one method to improve reliability in diagnosis?
Standardized diagnostic criteria
Structured interviews increase reliability by standardizing questions and reducing
variability
.
Why are reliability and validity critical for accurate diagnoses in mental health?
Effective treatment, better outcomes
High reliability in diagnosis ensures consistency, but may not always capture the complexities of patient
symptoms
What is a drawback of the DSM-5 in terms of validity?
Specific criteria may not align
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