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Psicothema was founded in Asturias (northern Spain) in 1989, and is published jointly by the Psychology Faculty of the University of Oviedo and the Psychological Association of the Principality of Asturias (Colegio Oficial de Psicólogos del Principado de Asturias).
We currently publish four issues per year, which accounts for some 100 articles annually. We admit work from both the basic and applied research fields, and from all areas of Psychology, all manuscripts being anonymously reviewed prior to publication.

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Psicothema, 2011. Vol. Vol. 23 (nº 3). 510-515




Actualización psicométrica y funcionamiento diferencial de los ítems en el State Trait Anxiety Inventory (STAI)

Alejandro Guillén-Riquelme y Gualberto Buela-Casal

Universidad de Granada

La ansiedad es uno de los problemas psicológicos con mayor prevalencia. Entre los instrumentos para medirla se encuentra el State Trait Anxiety Inventory. Este cuestionario mide ansiedad rasgo (factor de personalidad que predispone a sufrir o no ansiedad) y ansiedad estado (los factores ambientales que protegen o generan ansiedad). La adaptación española del cuestionario se realizó en 1982, por ello el objetivo del estudio es realizar una revisión del STAI. Para ello, se reunió una muestra de 1.036 adultos. Se realizó un análisis de fiabilidad mediante alfa de Cronbach (0,90 para ansiedad rasgo y 0,94 para ansiedad estado). También se realizó una reducción factorial con unos resultados similares a los de la adaptación original. Además, se comprobó si existía funcionamiento diferencial de ítem por sexo y únicamente una de las 40 preguntas mostró problemas. Por último se realizó comparaciones t-Student con los valores de la adaptación; mientras el rasgo varía en 1 punto, el estado tiene diferencias de hasta 6 puntos. En estos resultados de forma general se observa que el STAI mantiene unas adecuadas propiedades métricas y que, además, ha sido sensible al aumento de estímulos ambientales que producen estrés.

Psychometric revision and differential item functioning in the State Trait Anxiety Inventory (STAI). One of the psychological problems with highest prevalence is anxiety. The State Trait Anxiety Inventory is one of the instruments to measure it. This questionnaire assesses Trait Anxiety (understood as a personality factor that predisposes one to suffer from anxiety) and State Anxiety (refers to environment factors that protect from or generate anxiety). The questionnaire was adapted in Spain in 1982. Therefore, the goal of the study is to review the current psychometric properties of the STAI. A total of 1036 adults took part in the study. Cronbach’s alpha reliability was .90 for Trait and .94 for State Anxiety. Factor analysis showed similar results compared with the original data. Moreover, differential item functioning (DIF) was carried out to explore sex bias. Only one of the 40 items showed DIF problems. Lastly, a t-Test was run, comparing the original and current values; whereas Trait Anxiety varied in 1 point, State Anxiety had differences of up to 6 points. In general, this result shows that the STAI has maintained adequate psychometric properties and has also been sensitive to increased environmental stimuli that produce stress.

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