State-Trait Anxiety Inventory (Form Y/ STAI-Y)

Abstract

The State-Trait Anxiety Inventory (STAI), specifically Form Y (STAI-Y), stands as one of the most widely utilized self-report measures in psychological and medical research for the quantitative assessment of anxiety. Developed by Charles D. Spielberger and his associates, the STAI-Y is unique in its ability to differentiate between two fundamental, yet independent, dimensions of anxiety: State Anxiety (A-State), which is a transient emotional condition reflecting current feelings, and Trait Anxiety (A-Trait), which represents a stable, enduring personality characteristic or predisposition toward anxiety. Comprising 40 items, this standardized instrument provides researchers and clinicians with a robust tool for accurately measuring emotional distress and anxiety proneness across diverse populations.

Keywords

STAI-Y, State Anxiety, Trait Anxiety, Spielberger, self-report, emotional distress, psychometrics, psychological assessment, A-State, A-Trait

Authors

Charles D. Spielberger, R. L. Gorsuch, R. Lushene, P. R. Vagg, G. A. Jacobs

Purpose

The primary objective of the State-Trait Anxiety Inventory, Form Y, is to offer separate, psychometrically sound measures for two distinct conceptualizations of anxiety. It was intentionally designed to overcome the difficulty of distinguishing between a temporary, situational reaction (A-State) and a stable, underlying predisposition (A-Trait) within a single instrument. The inventory allows researchers to precisely monitor fluctuations in A-State in response to specific stressors or interventions, while simultaneously establishing a reliable baseline measure of A-Trait.

Beyond fundamental research, the instrument is invaluable in clinical environments for diagnostic screening, measuring baseline anxiety levels, and monitoring the effectiveness of psychological or pharmacological treatments. Its standardized scoring procedures and ease of administration have cemented its status as a standard measure in the field of psychometrics and clinical assessment globally.

Construct

The STAI-Y operationalizes the psychological construct of anxiety as having two independent dimensions, each measured by 20 items for a total of 40 items in the complete inventory.

State Anxiety (A-State) is defined as a transient emotional response characterized by immediate, subjective feelings of tension, apprehension, worry, and physiological activation of the autonomic nervous system. Respondents assess their feelings “right now, at this moment” using a 4-point intensity scale. In contrast, Trait Anxiety (A-Trait) refers to stable individual differences in anxiety proneness. Individuals scoring high in A-Trait are predisposed to perceive a broader range of situations as threatening and are likely to react to these situations with elevated A-State responses. A-Trait items require respondents to report how they “generally feel” over time.

Validity

The STAI-Y exhibits substantial evidence supporting its construct validity, confirming the theoretical separation between the State and Trait components of anxiety. Empirical factor analytic studies consistently validate the intended two-factor structure (A-State and A-Trait).

The scale also demonstrates high concurrent and predictive validity. The A-Trait subscale, in particular, correlates significantly with other established measures of chronic emotional distress, such as the Taylor Manifest Anxiety Scale (TMAS) and the IPAT Anxiety Scale. Crucially, discriminant validity is established by the differential sensitivity of the two scales: A-State scores are highly responsive to immediate situational stressors and emotional manipulations, while A-Trait scores maintain relative stability across varying environmental conditions. This ability to discriminate between transient and dispositional anxiety is central to the scale’s utility.

Reliability

The STAI-Y is characterized by excellent psychometric reliability, though the expected reliability indices differ between the two subscales due to their distinct conceptualizations. The A-State scale, measuring a fluctuating emotional state, exhibits high internal consistency, with Cronbach’s alpha values typically ranging from 0.90 to 0.94. This high internal consistency confirms that the 20 items measure the same transient construct at a specific point in time. Due to its measurement of a temporary state, its test-retest reliability is appropriately low.

Conversely, the A-Trait scale, designed to capture a stable personality characteristic, also shows high internal consistency (alphas generally 0.86 to 0.92) but also exhibits high test-retest reliability, often exceeding 0.70 across intervals of several weeks or months. This robust stability confirms its efficacy in measuring an enduring psychological trait or predisposition.

Factor Analysis

Consistent findings from factor analytic studies of the STAI-Y overwhelmingly support the designated two-factor structure: A-State and A-Trait. These factors are typically found to be moderately correlated, which logically reflects the conceptual link between a stable predisposition (Trait) and the temporary manifestation of anxiety (State).

While the primary interpretation relies on the two main independent factors, further exploratory factor analysis sometimes identifies secondary components within each scale. For the A-State scale, two factors related to Anxiety Present (negative affect items) versus Anxiety Absent (positive affect items) are often extracted. Similarly, the A-Trait scale may separate into components related to general worry, feelings of inadequacy, or lack of self-confidence. Nevertheless, the standard clinical and research application focuses on the overall scores derived from the two principal factors.

Instrument

Test Type: Self-report questionnaire, standardized psychological inventory

Format: Paper-and-pencil or digital administration, composed of 40 items (20 for A-State, 20 for A-Trait). Responses are recorded on a 4-point Likert scale.

Language Available: English (original), with numerous high-quality translations available, including Spanish, German, and French, ensuring broad global applicability for cross-cultural research.

Population Group: General population, clinical samples, and non-clinical samples exhibiting emotional distress.

Age Group: Typically utilized with adolescents (age 14 and older) and adults.

Population Details: The scale is extensively employed in university and college student populations, as well as in diverse patient groups undergoing psychological or medical treatment where stress measurement is required.

Test Methodology: Respondents use a 4-point scale to rate the A-State items based on how they feel “right now” (1 = not at all, 4 = very much so). They rate the A-Trait items based on how they “generally feel” (1 = almost never, 4 = almost always).

Keywords

A-State, A-Trait, psychological testing, emotional stability, psychopathology, stress measurement, mood disorders, test-retest reliability, internal consistency

Authors

Author ORCID Identifier: Not publicly standardized or provided in source material.

Affiliation Email addresses: Not publicly standardized or provided in source material.

Correspondence Address: Correspondence concerning permissions and official manuals is typically directed to the publisher, Consulting Psychologists Press (now Mind Garden, Inc.), or the primary author’s last known institutional affiliation.

Permissions & Fee and Test Year

The STAI-Y is a proprietary psychological instrument, originally published by Consulting Psychologists Press (CPP). Formal permissions and a licensing fee are required for obtaining the test manuals, scoring keys, and copyrighted materials necessary for research or clinical application. The original STAI Manual was first published in 1970, and the manual for the revised and current version, the State-Trait Anxiety Inventory (Form Y), was published in 1983.

Reference’s

• Spielberger, C. D., Gorsuch, R. L., & Lushene, R. (1970). STAI Manual of the State-Trait Anxiety Inventory. Palo Alto: Consulting Psychologists Press.

• Spielberger, C. D., Gorsuch, R. L., Lushene, R., Vagg, P. R., & Jacobs, G. A. (1983). Manual for the State-Trait Anxiety Inventory (form Y). Palo Alto: Consulting Psychologists Press.

• Levine, Rachel Permuth. (2007). Differences in Perceived Stress, Affect, Anxiety, and Coping Ability Among College Students in Physical Education Courses. University of Maryland, College Park. PhD Dissertation.

Items of the State-Trait Anxiety Inventory (Form Y/ STAI-Y)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way. The original PDF containing this instrument can be downloaded here: http://drum.lib.umd.edu/bitstream/1903/6811/1/umi-umd-4299.pdf

1. I feel calm ____

2. I feel secure ____

3. I am tense ____

4. I feel strained ____

5. I feel at ease ____

6. I feel upset ____

7. I am presently worrying over possible misfortunes _____

8. I feel satisfied ____

9. I feel frightened ____

10. I feel comfortable ____

11. I feel self-confident ____

12. I feel nervous ____

13. I am jittery ____

14. I feel indecisive ____

15. I am relaxed ____

16. I feel content ____

17. I am worried ____

18. I feel confused ____

19. I feel steady ____

20. I feel pleasant _____

21. I feel pleasant ____

22. I feel nervous and restless ____

23. I feel satisfied with myself ____

24. I wish I could be as happy as others seem to be ____

25. I feel like a failure ____

26. I feel rested ____

27. I am “calm‚ cool‚ and collected” ____

28. I feel that difficulties are piling up so that I cannot overcome them ____

29. I worry too much over something that really doesn’t matter ____

30. I am happy ____

31. I have disturbing thoughts ____

32. I lack self-confidence ____

33. I feel secure ____

34. I make decisions easily ____

35. I feel inadequate _____

36. I am content ____

37. Some unimportant thought runs through my mind and bothers me ____

38. I take disappointments so keenly that I can’t put them out of my mind ____

39. I am a steady person ____

40. I get in a state of tension or turmoil as I think over my recent concerns and interests ____

1 = not at all; 2 = somewhat; 3 = moderately so; 4 = very much so