Generic and diabetes-specific well-being in the AT.LANTUS follow-on study : further psychometric validation of the W-BQ28 indicates its utility in research and clinical practice in type 2 diabetes in the UK

Speight, J., Khagram, L. A. and Davies, M. J. 2012, Generic and diabetes-specific well-being in the AT.LANTUS follow-on study : further psychometric validation of the W-BQ28 indicates its utility in research and clinical practice in type 2 diabetes in the UK, Diabetic medicine, vol. 29, no. 9, pp. e345-e353.

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Title Generic and diabetes-specific well-being in the AT.LANTUS follow-on study : further psychometric validation of the W-BQ28 indicates its utility in research and clinical practice in type 2 diabetes in the UK
Author(s) Speight, J.
Khagram, L. A.
Davies, M. J.
Journal name Diabetic medicine
Volume number 29
Issue number 9
Start page e345
End page e353
Total pages 9
Publisher Wiley - Blackwell Publishing
Place of publication Chichester, England
Publication date 2012-09
ISSN 0742-3071
1464-5491
Keyword(s) AT.LANTUS trial
psychometric validation
type 2 diabetes
W-BQ28
well-being
Summary Aims  To undertake further psychometric validation of the W-BQ28 to determine its suitability for use in adults with Type 2 diabetes in the UK using data from the AT.LANTUS follow-on study.

Methods  A total of 353 people with Type 2 diabetes participated in the AT.LANTUS Follow-on study, completing measures of well-being (W-BQ28), treatment satisfaction (DTSQ) and self-care (SCI-R). Confirmatory factor analyses was used to confirm the W-BQ28 structure and internal consistency reliability was assessed. Additional statistical tests were conducted to explore convergent, divergent and known-groups validity. Minimal important differences were calculated using distribution and anchor-based techniques.

Results  Structure of the W-BQ28 (seven four-item subscales plus 16-item generic and 12-item diabetes-specific scales) was confirmed (comparative fit index = 0.917, root mean square error of approximation (RMSEA) = 0.057). Internal consistency reliability was satisfactory (four-item subscales: alpha = 0.73–0.90; 12/16-item scales: α = 0.84–0.90). Convergent validity was supported by expected moderate to high correlations (rs = 0.35–0.67) between all W-BQ28 subscales (except Energy); divergent validity was supported by expected low to moderate correlations with treatment satisfaction (rs = −0.03–0.52) and self-care (rs = 0.02–0.22). Known-groups validity was supported with statistically significant differences by sex, age and HbA1c for expected subscales. Minimal important differences were established (range 0.14–2.90).

Conclusions  The W-BQ28 is a valid and reliable measure of generic and diabetes-specific well-being in Type 2 diabetes in the UK. Confirmation of the utility of W-BQ28 (including establishment of minimal important differences) means that its use is indicated in research and clinical practice.
Language eng
Field of Research 170106 Health, Clinical and Counselling Psychology
111712 Health Promotion
111714 Mental Health
Socio Economic Objective 920401 Behaviour and Health
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2012, Wiley-Blackwell Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30052418

Document type: Journal Article
Collection: School of Psychology
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Created: Thu, 09 May 2013, 19:22:28 EST by Jane Speight

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