State-Trait Anxiety Inventory
Also known as: STAI, STAI-Y
The State-Trait Anxiety Inventory (STAI) is a 40-item self-report questionnaire designed to measure two distinct dimensions of anxiety: state anxiety (temporary anxiety in response to a specific situation) and trait anxiety (stable tendency to experience anxiety across situations). Developed by Charles D. Spielberger and colleagues in 1970, the STAI has become one of the most widely used research instruments for differentiating situational from dispositional anxiety in clinical and non-clinical populations.
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When to use it
The STAI is recommended for research and clinical settings where distinguishing state from trait anxiety is conceptually important, such as studies of stress responses, experimental manipulation of anxiety, or understanding individual differences in anxiety proneness. It is suitable for adolescents (aged 14 and older) and adults. The STAI is less appropriate as a rapid screening tool in busy clinical settings due to its length; the GAD-7 or BAI would be preferable for brief assessment.
Strengths & limitations
- Clear conceptual distinction — uniquely separates state from trait anxiety, allowing investigation of both situational and dispositional factors.
- Excellent psychometric properties — internal consistency (Cronbach's α ≥ 0.86 for both subscales), strong test-retest reliability for trait anxiety (r ≥ 0.73), and good concurrent validity.
- Extensively validated — translated and validated in 50+ languages across diverse cultural and clinical populations, with robust normative data.
- Sensitive to experimental manipulation — state anxiety subscale demonstrates responsiveness to stress induction and anxiety-reduction interventions, making it ideal for intervention research.
- Copyright restriction and cost — like the BAI, the STAI is copyrighted and requires purchase of materials or licenses, limiting free access.
- Length — 40 items require 6–8 minutes, making it more time-consuming than briefer screening instruments.
- Normative variation — interpretation requires access to appropriate normative tables stratified by age, gender, and population, which can complicate clinical interpretation.
Frequently asked
What is the difference between state anxiety and trait anxiety?
State anxiety (S-Anxiety) is a temporary emotional reaction to a specific situation (e.g., nervousness during a test). Trait anxiety (T-Anxiety) is a stable personality characteristic reflecting a general tendency to perceive situations as threatening and experience anxiety across contexts. High trait anxiety individuals show higher state anxiety in the same situations as low-trait individuals.
Can I use the STAI to diagnose an anxiety disorder?
No. The STAI measures anxiety symptom severity but is not diagnostic. Diagnosis requires a clinical interview and assessment against DSM-5 or ICD-11 criteria. The STAI is best used in research or to characterize anxiety levels in clinical samples with established diagnoses.
How do I interpret STAI scores if I do not have access to normative tables?
Raw scores (20–80) are difficult to interpret without normative data. Ideally, consult published normative tables for your population. Generally, scores above 60 suggest elevated anxiety, but this varies by population. In research, report raw scores; in clinical practice, convert to percentiles when possible.
Is the STAI copyrighted, and can I use it freely?
Yes, the STAI is copyrighted and owned by Mind Garden, Inc. (formerly Consulting Psychologists Press). You must obtain permission and typically purchase materials or licenses for clinical or research use. Permission is available for academic research and clinical assessment.
Sources
- Spielberger, C. D., Gorsuch, R. L., & Lushene, R. E. (1970). Manual for the State-Trait Anxiety Inventory. Palo Alto, CA: Consulting Psychologists Press. ISBN: 0929260008
- Spielberger, C. D. (1983). State-Trait Anxiety Inventory for Adults: Manual, Instrument and Scoring Guide. Redwood City, CA: Mind Garden, Inc. link ↗
How to cite this page
ScholarGate. (2026, June 3). State-Trait Anxiety Inventory. ScholarGate. https://scholargate.app/en/clinical-psychology/state-trait-anxiety-inventory
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
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