Psychometric evaluation of the Adelphi Adherence Questionnaire ( ADAQ ©) in a type 2 diabetes mellitus population as a new measure of adherence and the complex factors influencing adherence in routine care
Authors' conclusion
The ADAQ shows strong construct validity and high internal consistency reliability within a heterogenous T2DM population with negligible DIF between sub-groups. Future work should focus on test-retest reliability and detecting change over time.
Study context
- Population
- Adults with T2DM consulting physicians in routine clinical practice in the US; mean age 56.7 years (SD 12.8), 54.5% male
- Participants
- 1,287 adults
- Outcome
- Psychometric properties of the ADAQ© (dimensionality, composite scoring, DIF, internal consistency, construct validity)
Methodological detailscross-sectional survey, Adelphi T2DM Disease Specific Programme™, United States, February-May 2021
- Cross-sectional survey
- Adelphi T2DM Disease Specific Programme™
- United States
- February-May 2021
Performance
As reported in the abstract
ADAQ psychometric properties
Cronbach's alpha and McDonald's omega
≥0.90
Original publication
Psychometric evaluation of the Adelphi Adherence Questionnaire ( ADAQ ©) in a type 2 diabetes mellitus population as a new measure of adherence and the complex factors influencing adherence in routine care. Diabetes Obes Metab. Published 14 July 2025. doi:10.
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