Beck Anxiety Inventory (BAI): Psychometric Evaluation

General Features and Instrument Overview

The Beck Anxiety Inventory (BAI) was authored by Aaron T. Beck and Robert A. Steer and published by Pearson Education, Inc. in 1993. It is designed for individuals aged 17 years and older, and carries a qualification code of CL2.

The BAI is a tool used to measure the level of anxiety in persons aged 18 and above. It is a criteria-referenced assessment instrument that provides professionals with a strong basis on which to anchor their diagnoses and related clinical decisions (Beck et al., 1988; Beck & Steer, 1993). The instrument can be used to measure baseline anxiety in order to establish how effective treatment is over time. It can also be applied as an outcome measure during the post-treatment period.

The BAI targets adults and adolescents for the purpose of measuring their anxiety levels. It can be administered verbally by a trained expert or completed by self-administration and scored by hand.

The instrument uses either a manual scoring or a Q-global scoring approach. Q-global is an internet-based platform for test administration, scoring, and reporting. It is fast and efficient in organizing information for examinees, generating scores, and producing accurate and comprehensive reports. Scores range from 0 to 63 and are classified as minimal anxiety (0–7), mild anxiety (8–15), moderate anxiety (16–25), and severe anxiety (30–63), respectively (Beck et al., 1988; Gillis, Haaga, & Ford, 1995; Halfaker et al., 2011). Generally, scores are generated from the raw score, although T-scores also exist along with percentiles informed by Psych Corp's community adult sample.

Psychometric Properties

Respondents are asked to report how much they have been bothered during the past week — including the day of testing — by each of the 21 symptoms listed on the BAI. Each symptom is accompanied by four answer options: Not at all = 0; Mild = 1; Moderate = 2; Severe = 3 (Beck et al., 1988). The scoring procedure is straightforward for anyone with a basic knowledge of English. Furthermore, the tool has been validated in numerous languages across the globe, including Chinese, German, Icelandic, Spanish, and French, among others (Oh et al., 2018). Because it reliably discriminates between anxious and non-anxious individuals, the BAI is widely used as a screening tool across a broad range of clinical environments and multicultural communities.

In terms of reliability, 83 patients drawn from a group that had completed the BAI demonstrated an average item correlation of .60 (Beck & Steer, 1993; Biggs, 2008). Internal consistency, measured using Cronbach's alpha, ranges from .92 to .94 for adults, and the test-retest reliability coefficient is .75. The BAI has demonstrated acceptable reliability and also shows discriminant and convergent validity for individuals aged 14 to 18 years in both inpatient and outpatient settings (Beck et al., 1988; Gillis et al., 1995). These results are sufficient to warrant its continued use in clinical and research contexts.

Regarding validity, the BAI's concurrent validity compared with the Hamilton Anxiety Rating Scale is .51. Correlations with the State-Trait Anxiety Inventory (STAI) Form Y are .58 for the State subscale and .47 for the Trait subscale. The correlation with the seven-day mean anxiety rating from the Weekly Record of Anxiety and Depression is .54 (Beck et al., 1988; Beck & Steer, 1993). These figures collectively provide sufficient validity evidence to support a decision to use the instrument.

References

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