A new standard in dementia knowledge measurement: Comparative validation of the Dementia Knowledge Assessment Scale and the Alzheimer’s Disease Knowledge Scale.
2016
OBJECTIVES: To compare the psychometric performance
of the Dementia Knowledge Assessment Scale (DKAS) and
the Alzheimer’s Disease Knowledge Scale (ADKS) when
administered to a large international cohort before and
after online dementia education. DESIGN: Comparative psychometric analysis with
pre- and posteducation scale responses. SETTING: The setting for this research encompassed
7,909 individuals from 124 countries who completed the
9-week Understanding Dementia Massive Open Online
Course (MOOC). PARTICIPANTS: Volunteer respondents who completed
the DKAS and ADKS before (n = 3,649) and after
(n = 878) completion of the Understanding Dementia
MOOC. MEASUREMENTS: Assessment and comparison of the
DKAS and ADKS included evaluation of scale development
procedures, interscale correlations, response distribution,
internal consistency, and construct validity. RESULTS: The DKAS had superior internal consistency,
wider response distribution with less ceiling effect, and
better discrimination between pre- and posteducation
scores and occupational cohorts than the ADKS. CONCLUSION: The 27-item DKAS is a reliable and preliminarily
valid measure of dementia knowledge that is
psychometrically and conceptually sound, overcomes limitations
of existing instruments, and can be administered to
diverse cohorts to measure baseline understanding and
knowledge change.
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