Factor analysis of the items of the State-Trait Anxiety Inventory

Area of Science:

• Psychological assessment
• Anxiety research
• Psychometrics

Background:

• The State-Trait Anxiety Inventory (STAI) is widely used to measure anxiety.
• Spielberger's theory differentiates between state anxiety (momentary) and trait anxiety (dispositional).
• The factor structure of the STAI requires empirical validation.

Purpose of the Study:

• To investigate the underlying factor structure of the State-Trait Anxiety Inventory (STAI).
• To determine if the A-State and A-Trait scales accurately reflect Spielberger's theoretical constructs.
• To clarify the dimensional nature of anxiety as measured by the STAI.

Main Methods:

• Factor analysis was applied to the items of the STAI.
• The analysis examined the interrelationships between items on the A-State and A-Trait scales.
• Three distinct factors were extracted from the data.

Main Results:

• Factor I comprised exclusively A-State items, supporting the construct of state anxiety.
• Two separate factors emerged from the A-Trait scale items.
• Factor II related to general or typical state anxiety, and Factor III indicated neuroticism, diverging from the intended A-Trait construct.

Conclusions:

• The A-State scale effectively measures state anxiety.
• The A-Trait scale's structure does not fully align with Spielberger's concept of trait anxiety.
• The findings suggest the A-Trait scale may also capture neuroticism and general state anxiety levels.