Quality of Life in Alzheimer's Disease Scale

Overview

Purpose

Assessing quality of life

Respondent

Person with a Disability

Administration Method

Interview

Administration Mode

In-person

0

Population

Age Related Disability

Instrument Citation(s)

Psychometric Citations

• Thorgrimsen, L., Selwood, A., Spector, A., Royan, L., de Madariaga Lopez, M., Woods, R. T., & Orrell, M.
  (2003). Whose quality of life is it anyway? The validity and reliability of the Quality of Life-
  Alzheimer's Disease (QoL-AD) scale. Alzheimer Disease & Associated Disorders, 17(4), 201-208.

  Type of Publication

  Peer review

  Instrument Language

  English

  Sample: Age (Mean and Range)

  sample 1: 81.3 (6.0) [69–92]; sample 2: 85.3 (7.0) [66–101]

  Sample: Age Group

  65+ Years

  Sample: Countries/State

  United Kingdom

  Sample: Disability Type

  Age Related Disability

  Sample: Gender (%male)

  sample 1: 44 (73.3%); sample 2: 158 (78.6%)

  Sample: Race/Ethnicity (%)

  Not Reported

  Sample: Sampling Strategy

  Convenience Sample

  Sample: Size

  Sample 1 (n = 60); Sample 2
  (n = 201)

  Reliability: Inter-rater

  κ >0.70.

  Reliability: Internal Consistency

  Cronbach’s alpha coefficient of 0.82

  Reliability: Test-retest

  Overall ICC = 0.6 or above; κ = 0.37 for one item “family”; κ ranged from 0.40 to 0.74 for all other items.

  Validity: Construct (Convergent and Discriminant)

  The Bartlett’s Test of Sphericity reached statistical significance (p < 0.001), and the Kaiser- Meyer-Oklin value was 0.74, thus supporting the factorability of the correlation matrix.

  Validity: Content Validity (e.g., Expert Judgement)

  The scale was found to have good content validity with no additional items required and all items necessary.

  Validity: Criterion Validity (Concurrent and Predictive)

  It correlated well with the Dementia Quality of Life scale (0.69) and with the Euroqol-5D scale (0.54), indicating good criterion concurrent validity.

  Study design

  Cross-Sectional

• Logsdon, R., Gibbons, L.E., McCurry, S.M., Terri, L. (1999). Quality of life in Alzheimer’s disease: patient
  and caregiver reports. J Mental Health Aging, 5, 21–32.

  Type of Publication

  Peer review

  Instrument Language

  English

  Sample: Age (Mean and Range)

  average 78.3 years (sd = 6.1)

  Sample: Age Group

  65+ Years

  Sample: Countries/State

  Unknown

  Sample: Disability Type

  Age Related Disability

  Sample: Gender (%male)

  53

  Sample: Race/Ethnicity (%)

  86% Caucasian, 14% African American

  Sample: Sampling Strategy

  Convenience Sample

  Sample: Size

  77

  Reliability: Internal Consistency

  Coefficient Alpha = 0.88

  Reliability: Test-retest

  ICC = 0.76

  Validity: Criterion Validity (Concurrent and Predictive)

  Patient QoL-AD scores were modestly correlated with MMSE scores: r = 0.24, p<0.05

  Study design

  Cross-Sectional