Alzheimer’s disease related quality of life (ADRQL)

Abstract

The Alzheimer’s disease related quality of life (ADRQL) instrument is a proxy-rated assessment designed specifically to measure the health-related quality of life (HRQoL) in individuals suffering from dementia, particularly those with advanced cognitive impairment who are unable to provide reliable self-reports. Developed through rigorous methodology, the ADRQL focuses on domains relevant to the daily experiences and emotional well-being of persons living with Alzheimer’s disease, including social engagement, emotional state, and environmental responses. It serves as a vital tool for clinicians and researchers evaluating treatment efficacy and monitoring the impact of care interventions.

Keywords

ADRQL, Quality of Life, Alzheimer’s disease, Dementia, Proxy assessment, Geriatric psychiatry, Psychometrics, Caregiver burden.

Authors

Rabins, P. V., Kasper, J. D., Kleinman, L., Black, B. S., Patrick, D. L., Shore, A. D.

Purpose

The primary purpose of the ADRQL is to provide a standardized, observer-rated measure of health-related quality of life (HRQoL) that is sensitive to changes in functional and psychological status specific to individuals with Alzheimer’s disease. Traditional quality of life measures often rely on self-report, which becomes infeasible as cognitive decline progresses. The ADRQL overcomes this limitation by utilizing proxy reports, usually from professional or family caregivers, to capture observable behaviors and apparent emotional states over a defined period (typically the last two weeks).

This instrument is crucial for research studies focusing on pharmacological and non-pharmacological interventions, allowing for a robust assessment of whether these treatments improve the patient’s subjective well-being, even when profound cognitive impairment exists. Furthermore, it aids in clinically monitoring the progression of dementia and identifying specific areas of distress or contentment.

Construct

The ADRQL is a multidimensional construct designed to capture aspects of well-being that remain salient despite severe cognitive deterioration. The scale measures five distinct domains of quality of life relevant to persons with Alzheimer’s disease:

• Social Interaction
• Awareness of Self
• Feelings and Mood
• Enjoyment of Activities
• Response to Surroundings

These factors move beyond simple functional status (like ADLs) to focus on observable indicators of emotional health and connection to the environment and others, which are critical components of perceived well-being in this population.

Validity

The validity of the ADRQL has been extensively evaluated, particularly in the 2009 study by Kasper, Black, Shore, and Rabins. This research demonstrated strong evidence for the psychometric properties of the instrument. Content validity was established through expert consensus and focus groups to ensure the items accurately reflected the domains of HRQoL for this specific population.

Construct validity was supported by examining the relationships between the ADRQL scores and other measures of cognitive function, functional status, and behavioral symptoms (e.g., agitation or depression). Results typically indicate that better ADRQL scores correlate logically with better overall function and fewer problematic behaviors, confirming that the scale measures the intended construct of well-being related to Alzheimer’s disease.

Reliability

Reliability assessments of the ADRQL have focused on both internal consistency and inter-rater reliability, given its nature as a proxy instrument. Studies confirm that the scale exhibits acceptable to strong levels of internal consistency (often measured using Cronbach’s alpha) across its five domains, indicating that the items within each domain measure a common underlying construct.

Crucially, inter-rater reliability has been evaluated to ensure that different caregivers or observers, when rating the same patient, produce consistent results. High inter-rater reliability is essential for proxy instruments, confirming that the scale captures objective, observable behaviors rather than subjective caregiver interpretation.

Factor Analysis

Initial development of the ADRQL involved statistical techniques, including factor analysis, to identify and confirm the underlying structure of the scale. This analysis resulted in the confirmation of five distinct factors, or domains, which structure the instrument:

1. Social Interaction (12 items): Statements regarding relating to and being around other people (e.g., smiling, seeking contact, showing delight).
2. Awareness of Self (8 items): Statements concerning identity, important relationships, and personal history (e.g., awareness of family role, making choices).
3. Feelings and Mood (12 items): Statements about different types of behavior and emotional expression in the last two weeks (e.g., irritability, contentment, sadness).
4. Enjoyment of Activities (4 items): Statements about participation and pleasure derived from usual activities (e.g., enjoying activities alone, taking part in leisure).
5. Response to Surroundings (4 items): Statements regarding behavior and feelings related to the person’s living environment (e.g., feeling unsafe, wanting to leave).

This five-factor structure provides a comprehensive profile of the patient’s experience, moving beyond a single global score of quality of life.

Instrument

Test Type: Proxy-rated Health-Related Quality of Life (HRQoL) Scale

Format: Structured questionnaire using dichotomous response options (AGREE/DISAGREE) based on observations over the preceding two weeks.

Language Available: Primarily English (translations may exist in research contexts).

Population Group: Individuals diagnosed with Alzheimer’s disease or related dementias.

Age Group: Typically older adults (Geriatric population).

Population Details: Suitable for patients across various stages of dementia, but particularly valuable for those with moderate to severe cognitive impairment who cannot self-report.

Test Methodology: The scale is administered to a knowledgeable proxy (e.g., family member, primary caregiver, or nursing home staff) who rates the patient on 40 items across five domains.

Keywords

Geriatrics, Dementia assessment, Psychometric properties, Health outcomes, Caregiver, Caregiver Burden, Cognitive impairment.

Authors

Author ORCID Identifier: N/A (Information not provided in source material)

Affiliation Email addresses: N/A (Information not provided in source material)

Correspondence Address: Betty Black, Ph.D. (For use of the research instrument: [email protected])

Permissions & Fee and Test Year

The ADRQL is a proprietary research instrument. Researchers wishing to utilize the scale are directed to contact Dr. Betty Black for permission and usage details via email. The original conceptual framework and methodological development were published in 1999 (Rabins et al., 1999), with subsequent validation and reliability studies published in 2009 (Kasper et al., 2009). The instrument is widely referenced in academic literature focusing on Alzheimer’s disease research.

Reference’s

The instrument and its development are detailed in the following core references:

• Rabins, P. V., Kasper, J. D., Kleinman, L., Black, B. S., & Patrick, D. L. (1999). Concepts and methods in the development of the ADRQL: An instrument for assessing health-related quality of life in persons with Alzheimer disease. Journal of Mental Health and Aging, 5, 33-48.
• Kasper, J. D., Black, B. S., Shore, A. D., & Rabins, P. V. (2009). Evaluation of the validity and reliability of the Alzheimer’s disease related quality of life (ADRQL) assessment instrument. Alzheimer Disease and Associated Disorders, 23, 275-284. The full text can often be accessed via: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3086660/
• Shroff, H. B. (2014). Family Resiliency, Sense of Coherence, Social Support and Psychosocial Interventions: Reducing Caregiver Burden and Determining the Quality of Life in Persons with Alzheimer’s Disease. Florida Atlantic University, Doctoral Dissertation.

Items of the Alzheimer’s disease related quality of life (ADRQL)

Response Format: AGREE, DISAGREE

A. Those statements are about relating to and being around other people.

1. He/She smiles or laughs when around other people
2. He/She does not pay attention to the presence of others
3. He/She will stay around other people
4. He/She seeks contact with others by greeting people or joining in conversations
5. He/She talks with people
6. He/She touches or allows touching such as handshakes, hugs, kisses, pats
7. He/She can be comforted or reassured by others
8. He/She reacts with pleasure to pets or small children
9. He/She smiles or laughs or is cheerful.
10. He/She shows delight
11. He/She shows a sense of humor
12. He/She sits quietly and appears to enjoy the activity of others even though he/she is not active participating

B. These statements are about a person’s special identity and important relationships.

1. He/She talks about or still does things related to his/her previous work or daily activities
2. He/She is aware of his/her place in the family such as being a husband/wife, parent, or grandparent
3. He/She makes or indicates choices in routine daily activities such as what to wear, what to eat, or where to sit.
4. He/She shows interest in events, places or habits from his/her past such as old friends, former residences, church or prayer.
5. He/She does not respond to his/her own name
6. He/She does not express beliefs or attitudes that he/she always had.
7. He/She talks with people on the telephone.
8. He/She gets enjoyment from or is calmed by his/her possessions or belongings

C. These statements are about different types of behavior in the last 2 weeks.

1. He/She squeezes, twists, or wrings his/her hands
2. He/She throws, hits, kicks, or bangs objects.
3. He/She calls out or yells or curses or makes accusations
4. He/She locks or barricades himself/herself in his/her room/house/apartment
5. He/She is irritable or easily angered
6. He/She cries, wails, or frowns
7. He/She is restless and wound up, or repeats actions such as rocking, pacing, banging against walls
8. He/She resists help in different ways such as with dressing, eating or bathing, or by refusing to move.
9. He/She appears to be content or satisfied.
10. He/She becomes upset or angry when approached by another person.
11. He/She pushes, grabs, or hits people
12. He/She is upset or unsettled in his/her living environment.

D. These statements are about usual activities in the last 2 weeks.

1. He/She enjoys doing activities alone such as listening to music or watching TV
2. He/She does not take part in activities he/she used to enjoy, even when encouraged to take part
3. He/She shows no signs of pleasure or enjoyment when taking part in leisure activities or recreation
4. He/She dozes off or does nothing most of the time

E. These statements are about behavior in a person’s living environment in the last 2 weeks.

1. He/She talks about feeling unsafe or says his/her belongings are not safe
2. He/She is upset or unsettled when in places other than where he/she lives
3. He/She talks about wanting to leave or go home
4. He/She says he/she wants to die