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Health Qual Life Outcomes. 2008 Oct 28;6:87. doi: 10.1186/1477-7525-6-87.

Evaluating the reliability, validity and minimally important difference of the Taiwanese version of the diabetes quality of life (DQOL) measurement.

Author information

1
Department of Epidemiology and Health Policy Research, College of Medicine, University of Florida, Gainesville, FL, USA. ichuang@ufl.edu

Abstract

BACKGROUND:

Few diabetes HRQOL instruments are available in Chinese language. We tested psychometric properties of a Diabetes Quality of Life (DQOL) in Chinese language for diabetes patients in Taiwan and estimated its minimally important differences (MIDs).

METHODS:

Data were collected from 337 patients treated in diabetes clinics of a Taiwan teaching hospital. Pearson's correlations among domain scores of the DQOL (satisfaction, impact, and worry), the D-39S (a diabetes-specific instrument, including domains of diabetes control, energy and mobility, social burden and anxiety and worry, and sexual functioning) and the RAND-12 (a generic instrument, including physical health composite (PHC) and mental health composite (MHC)) were estimated to determine convergent/discriminant validity. Known-groups validity was examined using 2-hour postprandial plasma glucose (2 h PPG), hemoglobin A1c (HbA1c)) and presence of complications (retinopathy, neuropathy, and diabetic foot complications rather than the known groups of cardiovascular and cerebrovascular complications). We used a combined anchor- and distribution-based approach to establish MIDs.

RESULTS:

The DQOL scores were more strongly correlated with the physical domains of the D-39S (diabetes control and energy and mobility) and RAND-12 PHC than psychological domains of the D-39S (social burden, anxiety and worry, and sexual functioning) and RAND-12 MHC. The DQOL showed satisfactory discriminative ability for the known groups of 2 h PPG and HbA1c (effect size (ES) > or = 0.2) and retinopathy, neuropathy, and diabetic foot complications (ES > or = 0.3), but less satisfactory for the known groups of cardiovascular and cerebrovascular complications. MIDs for the DQOL domains were 3-5 points for satisfaction, 4-5 points for impact, 6-8 points for worry, and 3-4 points for overall HRQOL.

CONCLUSION:

We validated a DQOL in Chinese language for diabetes patients in Taiwan and provided MIDs to facilitate the measure of diabetes HRQOL.

PMID:
18957127
PMCID:
PMC2603003
DOI:
10.1186/1477-7525-6-87
[Indexed for MEDLINE]
Free PMC Article

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