Brief Assessment Schedule Depression (BAS-D)

Abstract

The Brief Assessment Schedule Depression (BAS-D) is a psychological screening instrument derived as a component of the larger Comprehensive Assessment and Referral Evaluation (CARE) developed by Gurland and colleagues (1977). It was initially designed for the efficient identification of depression symptoms, particularly within older adult populations. Its utility led to a significant modification in 1994, resulting in the Even Briefer Assessment Scale for Depression (EBAS-DEP) by Allen et al., which features a significantly reduced item count for quicker administration. The EBAS-DEP is highly practical for rapid assessment in settings like primary care or geriatric psychiatry. Both scales aim to capture a broad spectrum of depressive indicators, encompassing affective, somatic, and cognitive symptoms.

Keywords

Depression, BAS-D, EBAS-DEP, Geriatric Assessment, Mood Disorder, Screening Scale, Affective Symptoms, Comprehensive Assessment and Referral Evaluation (CARE), Late Life Depression, Anhedonia.

Authors

B. J. Gurland, J. Kuriansky, L. Sharpe, R. Simon, P. Stiller, P. Birkett (Primary authors of the foundational CARE instrument), N. Allen, D. Ames, D. Ashby, K. Bennetts, V. Tuckwell, C. West, S. Weyerer, U. Killmann (Key contributors to the EBAS-DEP).

Purpose

The core purpose of the BAS-D and its highly efficient derivative, the EBAS-DEP, is the swift and sensitive identification of clinically significant depressive symptoms, especially among vulnerable populations such as the elderly. These scales were developed specifically to address the need for brief, sensitive tools capable of detecting depression in late life, where complex medical comorbidities and cognitive changes can often obscure standard diagnostic presentations. The BAS-D assesses a wide range of depressive indicators, including psychological, somatic, and cognitive symptoms, focusing on the individual’s experience over the preceding month.

The EBAS-DEP represents an optimization of this function, serving as a highly efficient and sensitive measure for screening depression in late life. Its brevity makes it practical for large-scale epidemiological studies or routine clinical checks in non-specialist medical settings. This streamlined approach ensures prompt identification and facilitates timely referral and intervention for potential mood disorders.

Construct

The scale measures the psychological construct of depression, defined by a cluster of affective, cognitive, and somatic symptoms typically observed over the past month. Key domains assessed include core mood states (sadness, unhappiness), diminished capacity for pleasure (anhedonia), vegetative signs (e.g., sleep and appetite disturbances), negative cognitions (pessimism, self-blame), and the presence of suicidal ideation.

While the item content aligns closely with criteria commonly associated with major depressive episodes, the scale itself functions as a dimensional measure focusing on symptom severity rather than providing a categorical diagnostic tool. The inclusion of items pertaining to worry and loneliness further suggests its utility in assessing common comorbidities in older adults, such as generalized anxiety and social isolation.

Validity

Although the BAS-D is integrated within the extensive CARE instrument, significant research has focused on establishing the robust psychometric properties of the EBAS-DEP (Allen et al., 1994; Weyerer et al., 1999). These studies confirm strong evidence of validity, demonstrating good concurrent validity through high correlations with established, longer depression measures, such as the Geriatric Depression Scale (GDS) and the Hamilton Rating Scale for Depression (HAM-D).

The EBAS-DEP has proven to be a highly sensitive screener, capable of accurately differentiating between depressed and non-depressed individuals across clinical and community samples of the elderly. Its practical clinical value is underscored by its predictive validity, effectively identifying those individuals who are likely to meet full diagnostic criteria for depression upon subsequent, comprehensive psychiatric assessment.

Reliability

Reliability assessments, primarily conducted on the EBAS-DEP, demonstrate strong internal consistency. This indicates that the reduced set of items reliably measures the unified, underlying construct of depression, with the original EBAS-DEP study reporting satisfactory reliability coefficients. This coherence is critical given the scale’s brevity and its intended use in rapid assessment.

Furthermore, the scale exhibits acceptable test-retest reliability. This stability of scores over short intervals, assuming no significant clinical change, confirms its suitability as a reliable screening instrument for repeated administration, allowing clinicians to effectively track symptom trajectories and treatment response over time.

Factor Analysis

Factor analytic studies of the full BAS-D (or the relevant depression sub-section of the parent CARE instrument) often suggest a multi-dimensional structure, reflecting the complex and heterogeneous nature of depressive symptomatology, which includes affective, cognitive, and somatic components.

In contrast, the highly abbreviated EBAS-DEP, containing only eight items, is generally treated as a strong single-factor instrument. Research confirms that the abbreviated items load heavily onto one principal component, representing overall depressive severity and a core dimension of affective disturbance and anhedonia. This structural simplicity supports its use as a unified clinical screening tool rather than a detailed diagnostic instrument designed to differentiate subtle symptom clusters.

Instrument

Test Type: Self-report or Clinician-administered interview/rating scale (Screening instrument)

Format: Structured or Semi-structured interview, yielding dimensional scores.

Language Available: Primarily English; translations are available for international research settings (e.g., German translations used in Weyerer et al., 1999).

Population Group: Clinical and community samples.

Age Group: Adults, specifically older adults and the elderly (late life).

Population Details: Developed initially for comprehensive assessment of the elderly in various care settings; highly relevant for geriatric psychiatry and primary care settings.

Test Methodology: Items are typically rated dichotomously (Yes/No) or on a low-point severity scale, focusing on the occurrence or intensity of symptoms over the past month. The EBAS-DEP utilizes specific skip logic (e.g., Question 6 leading to 7) to maximize administrative efficiency.

Keywords

Late life depression, EBAS-DEP, Affective symptoms, Somatic symptoms, Suicidal ideation, Psychopathology, Mental health screening.

Authors

Author ORCID Identifier: Information not provided in source content.

Affiliation Email addresses: Information not provided in source content.

Correspondence Address: Information not provided in source content.

Permissions & Fee and Test Year

The foundational instrument, the Comprehensive Assessment and Referral Evaluation (CARE), from which the BAS-D is derived, was published in 1977. The Even Briefer Assessment Scale for Depression (EBAS-DEP) was subsequently published in 1994 and further validated in 1999. Specific fee structures and commercial permissions for the use of these derivative scales are generally managed through the publishing entities associated with the broader CARE framework or related academic publications. The instrument is mentioned as being available at the following location: http://www.edits.net/products/psychological-assessments/st-dacl.html. The original PDF referenced in the source content can be downloaded here: www.a4ebm.org/sites/default/files/Measuring%20Health.pdf.

Reference’s

Allen, N., Ames, D., Ashby, D., Bennetts, K., Tuckwell, V., West, C. (1994). A brief sensitive screening instrument for depression in late life. Age and Ageing, 23:218.

Gurland, B. J., Kuriansky, J., Sharpe, L., Simon, R., Stiller, P. and Birkett, P. (1977) The comprehensive assessment and referral evaluation (CARE)-rationale, development and reliability. Int. J. Ageing Hum. Devel. 8, 9-42.

McDowell, Ian. (2006). Measuring Health: A Guide to Rating Scales and Questionnaires, Third Edition. OXFORD UNIVERSITY PRESS.

Weyerer, S., Killmann, U., Ames, D., Allen, N. (1999). The even briefer assessment scale for depression (EBAS-DEP). Int J Geriatr Psychiatry, 14:473–480.

Items of the Brief Assessment Schedule Depression (BAS-D)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

• 1. Admits to worrying in the last month
• 2. Worries about almost everything
• 3. Sad or depressed mood in last month
• 4. Depression lasts longer than a few hours
• 5. Depression worst at beginning of the day
• 6. Has felt life not worth living in past month
• 7. Has not felt happy in last month
• 8. Bothered and depressed by current loneliness
• 9. Almost nothing enjoyed lately
• 10. Less enjoyment than 1 year ago
• 11. Less enjoyment because depressed/nervous
• 12. Has had episodes of depression longer than 1week duration prior to past year
• 13. Reports headaches in past month
• 14. Poor appetite in the absence of medical cause
• 15. Slowed in physical movement compared to 1year ago
• 16. Difficulty sleeping due to altered moods‚ thoughts or tension
• 17. Has cried or felt like crying in past month
• 18i. Pessimistic or empty expectations of future
• 18ii. Thinks future bleak or unbearable
• 19i. Has wished to be dead in past month
• 19ii. Suicidal thoughts
• 19iii. Serious consideration of methods of suicide or actual attempts in past month
• 20. Obvious self-blame present
• 21. Describes self as not very happy/not at all happy (opposed to fairly or very happy)

The Even Briefer Assessment Scale for Depression (EBAS DEP) items (Allen et al. 1994) are:

1. Do you worry? In the past month?
2. Have you been sad or depressed in the past month?
3. During the past month have you ever felt that life was not worth living?
4. How do you feel about your future? What are your hopes for the future?
5. During the past month have you at any time felt you would rather be dead?
6. Do you enjoy things as much as you used to—say like you did a year ago?
7. Is it because you are depressed or nervous that you don’t enjoy things as much? (Asked only if question 6 rated 1)
8. In general how happy are you? (Read out: Are you—very happy—fairly happy—not very happy—or—not happy at all?)