State–Trait Anxiety Inventory

The State-Trait Anxiety Inventory (STAI), developed by American psychologist Charles D. Spielberger and colleagues in 1970, is among the most widely used anxiety measures internationally. Its 40 items form two independent subscales: State Anxiety (S-AI, first 20) and Trait Anxiety (T-AI, last 20). It distinguishes temporary anxiety in a particular moment or situation from a relatively stable anxious disposition. It is used in clinical diagnosis, treatment evaluation, stress research, and personality assessment.

State and trait anxiety are distinct but related. ① State anxiety is temporary tension, worry, unease, and autonomic arousal in a particular situation. It fluctuates, for example rising before an exam, interview, or speech and falling when the pressure passes. It reflects feelings here and now. ② Trait anxiety is a relatively stable tendency to respond anxiously across situations. People with high trait anxiety more readily see situations as threatening and experience state anxiety more often. It reflects the usual pattern over time. State anxiety asks 'How do I feel now?' while trait anxiety asks 'Am I usually prone to anxiety?'

The STAI uses a 4-point scale (1–4). Each subscale is scored separately, with a range of 20–80. Items such as I feel calm are reverse-scored: 1 becomes 4, 2 becomes 3, 3 becomes 2, and 4 becomes 1. Normative comparison values vary by age and sex and use the 95th percentile. For example, among men aged 19–39, state anxiety >53 or trait anxiety >56 may indicate an unusually high level. A state score well above the trait score suggests considerable stress in the current situation. A trait score well above the state score suggests a more enduring anxious disposition. Higher scores indicate greater anxiety. Scores above the relevant comparison value, or significant distress regardless of score, warrant professional assessment.

STAI suits adults, usually aged 18 and above. Uses include: ① Clinical screening, support for diagnosis, and treatment evaluation, with state anxiety capturing change. ② Stress research, such as exam, preoperative, or competition anxiety. ③ Personality assessment through trait anxiety and coping style. ④ Counseling to clarify anxiety patterns and plan intervention. ⑤ Research in psychology, medicine, and education using a standard anxiety measure. Assessing both temporary and stable anxiety provides a fuller basis for support.

High scores on both suggest significant current anxiety and a strong anxious disposition, warranting attention. ① For the short term, learn deep breathing, progressive muscle relaxation, or mindfulness, identify current stressors, adjust routines, and exercise moderately. ② For the longer term, seek counseling or treatment. CBT can effectively identify and change anxious thought patterns and teach coping strategies. ③ If anxiety seriously affects daily life, consult a psychiatrist about whether medication is needed. ④ Understand your pattern, develop constructive coping, and build support. Anxiety can improve, and professional help can make recovery faster.

Seek professional help if: ① Either subscale exceeds your age- and sex-specific 95th percentile, such as state >53 or trait >56 for men aged 19–39. ② State anxiety remains high for weeks without an obvious stressor. ③ Trait anxiety is very high, such as >60, suggesting a disposition that affects quality of life. ④ Anxiety includes marked palpitations, sweating, shaking, breathing difficulties, or panic attacks. ⑤ It substantially affects life, work, study, or relationships. ⑥ You feel significant distress despite scores within the normal range. A counselor or psychiatrist can assess you and provide CBT, mindfulness-based therapy, or medication if necessary. Early intervention works better; do not wait until symptoms become severe.