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Overall, concurrent validity of the HADS was deemed good to very good in a comprehensive review (31), with comparable sensitivity and specificity of longer scales including the General Health Questionnaire, the STAI, and the Symptom Checklist-90 anxiety scales.

Both are free and easy to use tools to screen or measure anxiety symptoms. The STAI seems to be more a measure of general distress (i.e. neuroticism or negative affect) than a specific measure of anxiety as it is usually understood.

The STAI includes a 40 question response taking approximately 10-20 minutes for completion and the test is given in tens of different languages worldwide. This test is split into the S-Anxiety scale and the T-Anxiety scale, each having 20 items.

Translations are available free of charge with your STAI-AD License to Reproduce purchase.

The STAI is appropriate for those who have at least a sixth-grade reading level. Internal consistency coefficients for the scale have ranged from . 86 to . 95; test-retest reliability coefficients have ranged from .

The total score ranges from 0 63. The following guidelines are recommended for the interpretation of scores: 0 9, normal or no anxiety; 10 18, mild to moderate anxiety; 19 29, moderate to severe anxiety; and 30 63, severe anxiety.

Translations are available free of charge with your STAI-AD License to Reproduce purchase.

Each scale asks twenty questions each and are rated on a 4-point scale. Low scores indicate a mild form of anxiety whereas median scores indicate a moderate form of anxiety and high scores indicate a severe form of anxiety. Both scales have anxiety absent and anxiety present questions.

State anxiety reflects the psychological and physiological transient reactions directly related to adverse situations in a specific moment. In contrast, the term trait anxiety refers to a trait of personality, describing individual differences related to a tendency to present state anxiety.