Item distribution, internal consistency, and structural validity of the German version of the DEMQOL and DEMQOL-proxy.
BMC Geriatr
; 18(1): 247, 2018 10 19.
Article
in En
| MEDLINE
| ID: mdl-30340468
ABSTRACT
BACKGROUND:
Accurate assessment of health-related quality of life as an endpoint in intervention studies is a major challenge in dementia research. The DEMQOL (29 items) and the proxy version (32 items), which is partly based on the DEMQOL, are internationally used instruments. To date, there is no information on the structural validity, item distribution, or internal consistency for the German language version of these questionnaires.METHODS:
This psychometric study is based on a secondary data analysis of a sample of 201 outpatients with a mild form of Alzheimer's disease (AD) and their informal caregivers. The informal caregivers who were interviewed were involved in the care of the person with AD several times per week. The analysis for the evaluation of the structural validity was performed using Mokken scale analysis. The internal consistency was calculated using the ρ of the Molenaar Sijtsma statistic and Cronbach's α.RESULTS:
For both versions, four subscales were identified [A] "positive emotions", [B] "negative emotions", [C] "physical and cognitive functioning", and [D] "daily activities and social relationships". For both instruments, the internal consistency of all subscales was considered "good" (ρ = 0.71-0.88, α = 0.72-0.87).CONCLUSIONS:
The results are a first indication of good construct validity of the instruments used for the German setting. We recommend further investigations of the test-retest reliability and the inter-rater reliability of the proxy instrument.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Quality of Life
/
Surveys and Questionnaires
/
Caregivers
/
Proxy
/
Alzheimer Disease
Type of study:
Clinical_trials
/
Observational_studies
/
Prognostic_studies
/
Qualitative_research
/
Risk_factors_studies
Aspects:
Ethics
/
Patient_preference
Limits:
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Country/Region as subject:
Europa
Language:
En
Journal:
BMC Geriatr
Journal subject:
GERIATRIA
Year:
2018
Document type:
Article
Affiliation country:
Alemania