Alzheimer’s disease related quality of life (ADRQL)

Abstract

The Alzheimer’s disease related quality of life (ADRQL) instrument is a specialized, observer-rated scale designed to assess the health-related quality of life (HRQoL) in individuals diagnosed with Alzheimer’s disease (AD). Recognizing the cognitive limitations that prevent AD patients from self-reporting their quality of life, the ADRQL relies on proxy reports, typically provided by trained staff or a primary caregiver. The scale covers five distinct domains crucial to well-being in this population: Social Interaction, Awareness of Self, Feelings and Mood, Enjoyment of Activities, and Response to Surroundings. The instrument offers a necessary tool for clinical trials and longitudinal studies focused on improving care outcomes for geriatric patients with dementia.

Keywords

Alzheimer’s disease, Quality of Life, HRQoL, Dementia, Caregiver burden, Observer-rated scale, Geriatric assessment, Psychometrics, Social Interaction, Affective state.

Authors

Paul V. Rabins, Judith D. Kasper, Lawrence Kleinman, Betty S. Black, Donald L. Patrick.

Purpose

The primary purpose of the ADRQL is to provide a reliable and valid measure of the quality of life for individuals living with Alzheimer’s disease, especially those in moderate to severe stages who may lack the capacity for accurate self-assessment. Standard quality of life instruments often fail to capture the unique aspects of well-being relevant to persons with cognitive impairment. The ADRQL addresses this gap by focusing on observable behaviors and affective states that reflect the individual’s experience, allowing clinicians and researchers to monitor changes in well-being resulting from treatment, environmental adjustments, or disease progression.

The scale is intended for use in research settings to evaluate the effectiveness of pharmacological and psychosocial interventions. By using a proxy-rated format, the instrument ensures that the assessment remains feasible even as the patient’s condition declines. The development of the ADRQL was driven by the need for a sensitive outcome measure that moves beyond purely cognitive or functional metrics to include the holistic experience of the patient.

Construct

The ADRQL measures the psychological construct of health-related quality of life (HRQoL) specific to the context of dementia. This construct is operationalized through five core domains, which represent facets of life that remain relevant and measurable despite significant cognitive decline. These domains were derived empirically and conceptually to reflect basic human needs and remaining capabilities.

The five domains, or subscales, that constitute the ADRQL construct are:

• Social Interaction: Measures the patient’s engagement and responsiveness to others, including smiling, laughing, seeking contact, and responding to comfort.
• Awareness of Self: Assesses the maintenance of personal identity, recognition of relationships (e.g., family roles), and ability to express choices or interests related to their past.
• Feelings and Mood: Captures observable emotional states, including expressions of contentment, anger, sadness, restlessness, or agitation.
• Enjoyment of Activities: Focuses on the patient’s ability to derive pleasure or satisfaction from typical daily and leisure activities.
• Response to Surroundings: Measures the patient’s sense of security and comfort within their immediate living environment, including feelings of safety or desire to leave.

Validity

The validity of the ADRQL has been extensively evaluated, particularly in the 2009 study by Kasper, Black, Shore, and Rabins. Construct validity was supported by demonstrating that the five hypothesized domains were conceptually sound and statistically separable. The instrument showed expected correlations with measures of disease severity and functional status, confirming that it was measuring a distinct construct—HRQoL—rather than simply duplicating measures of cognitive impairment (e.g., MMSE scores).

Discriminant validity was established by showing that the ADRQL scores were statistically distinguishable from measures of objective functional status, indicating that the scale captures the subjective or experiential component of well-being. Furthermore, the instrument demonstrated responsiveness to change, suggesting strong criterion validity for use in intervention studies aiming to improve patient outcomes.

Reliability

The ADRQL exhibits strong psychometric properties, particularly regarding its reliability. The scale has demonstrated high levels of internal consistency, meaning that the items within each of the five domains are highly correlated and measure the same underlying trait.

In studies evaluating the scale, including those by Kasper et al. (2009), inter-rater reliability was a critical focus, given its reliance on proxy assessment. High agreement between different caregivers or trained observers scoring the same patient confirmed that the behavioral items are clearly defined and consistently interpreted, making the scale robust for use across various care settings (nursing homes, assisted living, or home care). These high reliability indices underscore the ADRQL’s utility as a standardized measure in geriatric research.

Factor Analysis

The development of the ADRQL was guided by rigorous factor analysis to ensure that the instrument’s structure accurately reflects the multifaceted nature of HRQoL in AD patients. Initial exploratory and subsequent confirmatory factor analyses confirmed the theoretical model consisting of five distinct factors: Social Interaction, Awareness of Self, Feelings and Mood, Enjoyment of Activities, and Response to Surroundings.

These analyses demonstrated that the items clustered logically into these five dimensions, supporting the scale’s multidimensional design. This structure allows researchers not only to derive a total quality of life score but also to analyze specific areas of strength or deficit for the patient, which is essential for tailoring care plans and evaluating targeted psychosocial interventions.

Instrument

Test Type: Observer-rated assessment scale (Caregiver proxy measure)

Format: Multi-item questionnaire, typically 41 items across 5 domains. Items are rated on a dichotomous scale (AGREE, DISAGREE) based on observations over the preceding two weeks.

Language Available: Primarily English; translations may exist for research purposes.

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

Age Group: Typically geriatric population (65 and older).

Population Details: Suitable for patients across various stages of dementia, though particularly useful for those whose cognitive impairment precludes reliable self-report.

Test Methodology: A trained caregiver or proxy observes the patient over a specified period (usually two weeks) and rates the frequency or presence of specific behaviors and affective states described in the items.

Keywords

Dementia assessment, Observer scale, Proxy rating, Cognitive impairment, Health-related quality of life, Psychometric validation, Gerontology, Affective symptoms.

Authors

Author ORCID Identifier: Not uniformly available or provided in source content.

Affiliation Email addresses: Betty Black, Ph.D. ([email protected]) for permission inquiries.

Correspondence Address: Associated with Johns Hopkins Medicine (Geriatric Neuropsychiatry Research).

Permissions & Fee and Test Year

The ADRQL instrument was developed starting around 1999 (Rabins et al., 1999). For research use of the ADRQL instrument, permissions must be sought directly from the authors. Interested parties should email Betty Black, Ph.D. at [email protected]. Information regarding potential usage fees is determined upon request and specific research context.

Reference’s

The instrument documentation and related research can be found at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3086660/ and https://www.hopkinsmedicine.org/psychiatry/specialty_areas/geriatric_neuro/research/adrql.html.

• 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.
• Shroff‚ Havovi 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)

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

The rating scale requires the proxy to choose between AGREE or DISAGREE for each statement.