One idea, two time frames
The inventory was designed as one set of questions that, with the right instructions, could target a particular kind of anxiety.1 Its 40 items split evenly between the two scales.5
Why the state score moves and the trait score doesn't
Give a fictional person a general tendency, then tap each day to change what happens. The "right now" score follows events; the "in general" score stays put.
Invented numbers on the STAI's 20–80 range, for illustration. Not real items, norms or cut-offs.
The numbers back the distinction
If the two scales measure what they claim, trait scores should hold steady on retest while state scores drift. Spielberger's figures fit: test-retest correlations of .54 for the state scale and .86 for the trait scale.9
Low retest agreement would count against most tests. For a state scale it's intended, because moods change.
1964, 1970 or 1983?
Most sources credit the 1970 manual to Spielberger, Gorsuch and Lushene.8 One also lists Vagg and Jacobs as 1970 collaborators, although they appear on the 1983 Form Y manual.5,7
More than 30 languages, and into drug trials
References
- [1]Wikipedia contributors. State-Trait Anxiety Inventory (accessed 30 Sept 2026).en.wikipedia.org
- [2]Efficacy trial of a dissonance-based eating disorder program: protocol NCT03796091 (STAI Form Y). ClinicalTrials.gov (PDF).cdn.clinicaltrials.gov
- [3]State–Trait Anxiety Inventory Self Evaluation Questionnaire, Form Y (STAI). ResearchGate.researchgate.net
- [4]State-trait anxiety inventory (STAI). ResearchGate.researchgate.net
- [5]State-Trait Anxiety Inventory (STAI). EBSCO Research Starters: Health and Medicine.ebsco.com
- [6]Validation of the state version of the State-Trait Anxiety Inventory. University of Texas at Tyler, ScholarWorks (PDF).scholarworks.uttyler.edu
- [7]Spielberger, C. D., Gorsuch, R. L., Lushene, R. E., Vagg, P. R., & Jacobs, G. A. (1983). Manual for the State-Trait Anxiety Inventory (Form Y1–Y2). Consulting Psychologists Press. ResearchGate record.researchgate.net
- [8]Spielberger State-Trait Anxiety Inventory: list of references incl. the 1970 and 1983 manuals and Sesti (2000). OUCI.ouci.dntb.gov.ua
- [9]State-Trait Anxiety Inventory (STAI). Statistics Solutions (PDF).statisticssolutions.com
- [10]State Trait Anxiety Inventory: background. Advanced Assessments (PDF).advancedassessments.co.uk
Related historical tests
Beck's self-report depression questionnaire from nine years earlier. The STAI is often used alongside such measures to tell anxiety and depression apart.
Hamilton's scale is rated by a clinician after an interview. The STAI is filled in by the person, and adds a time frame: now versus in general.
Another self-report questionnaire of stable personality traits. The STAI adds a second scale for the passing state as well.
A performance test of concentration used as an outcome in clinical trials. The STAI plays a similar role for anxiety.
The TAT asked people to tell stories about pictures, which clinicians interpreted. The STAI simply asks people to rate their own feelings.