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The State-Trait Anxiety Inventory, Trait version: structure and content re-examined
P J Bieling1, M M Antony, R P Swinson
1Department of Psychiatry, University of Pennsylvania, Philadelphia 19104-2648, USA.
Behaviour Research and Therapy
|July 31, 1998
Summary
The State-Trait Anxiety Inventory (STAI) trait scale may measure depression and anxiety. New analysis suggests distinct subscales for anxiety/worry and sadness/self-deprecation, impacting clinical interpretation.
Area of Science:
- Psychological assessment
- Clinical psychology
- Psychometrics
Background:
- The State-Trait Anxiety Inventory (STAI) is widely used for anxiety assessment.
- Previous research indicates the STAI trait scale might also capture depressive symptoms.
Purpose of the Study:
- To investigate the factor structure of the STAI trait scale.
- To determine if the STAI trait scale differentiates between anxiety and depression constructs.
Main Methods:
- Factor analysis was employed to examine the trait items' structure.
- Confirmatory factor analysis identified a hierarchical model with two lower-order factors.
- Subscale performance was evaluated in individuals diagnosed with anxiety disorders.
Main Results:
- A hierarchical model with two lower-order factors provided the best fit for the data.
- One subscale correlated with anxiety and worry; the other with sadness and self-deprecation.
- These subscales showed differential correlations with other anxiety and depression measures and distinguished diagnostic groups.
Conclusions:
- The STAI trait scale appears to measure both anxiety and depressive symptoms.
- The identified subscales offer a more nuanced understanding of the STAI's psychometric properties.
- Clinical interpretation of STAI trait scores should consider its dual-factor nature.
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