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Area of Science:

  • Psychometrics
  • Clinical Psychology
  • Anxiety Research

Background:

  • The Spielberger State-Trait Anxiety Inventory (STAI) is a widely used measure for state and trait anxiety in research and clinical settings.
  • Understanding the psychometric properties of translated versions, like the German STAI trait scale (STAI-T), is crucial for accurate assessment.

Purpose of the Study:

  • To evaluate the temporal stability of the German STAI-T across different time intervals.
  • To assess the convergent and discriminant validity of the German STAI-T within a nomological network.
  • To clarify the specific constructs measured by the STAI-T, particularly its relationship with negative emotionality.

Main Methods:

  • Two independent samples of Caucasian participants (N=105 and N=120) were utilized.
  • The temporal stability of the STAI-T was examined over intervals ranging from 5 to 41 months.
  • Convergent and discriminant validity were assessed by analyzing the STAI-T's correlations with other psychological measures, including those for depression.

Main Results:

  • Temporal stability of the STAI-T ranged from .42-.67 for longer intervals (20-41 months) and .81-.87 for shorter intervals (5-12 months), decreasing with increased time.
  • STAI-T stability estimates were comparable to those of related psychological constructs.
  • The STAI-T demonstrated significant shared variance with measures of negative emotionality, such as depression, suggesting it does not exclusively measure anxiety.

Conclusions:

  • The German STAI-T exhibits moderate to good temporal stability, which diminishes over longer periods.
  • The findings suggest the STAI-T measures broader negative emotionality, including depressive symptoms, rather than anxiety in isolation.
  • These psychometric insights are vital for researchers using the STAI-T for longitudinal predictions and intervention outcome evaluations.