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Validity and reliability of the 19-item Audit of Diabetes-Dependent Quality of Life (ADDQoL-19) questionnaire in Chinese patients with type 2 diabetes mellitus in primary care

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Abstract

Background

This study aimed to determine the psychometric properties of the 19-item Audit of Diabetes-Dependent Quality of Life (ADDQoL-19) in Chinese patients with type 2 diabetes mellitus (T2DM) in primary care setting.

Methods

The ADDQoL-19 and SF-12v2 were administered to 386 Chinese patients with T2DM in public primary outpatient clinic in Hong Kong. Internal consistency reliability was determined by Cronbach’s alpha, whereas construct validity was assessed by the Spearman’s correlations between the scores of the ADDQoL-19 and SF-12v2. Independent t tests were used in known-group comparisons to identify the differences in the ADDQoL-19 scores between respondents with different duration of diabetes, treatment modalities, body mass index and glycemic control.

Results

The ADDQoL-19 had a moderate to weak correlation with SF-12v2 in convergent validity but with statistically significant results in known-group comparisons. Good internal consistency was generated with an acceptable value of 0.81, which was comparable to original English version. Construct validity was proven except the convergent validity is found to be weak with the generic SF-12v2, which was similar to the results in prior psychometric studies.

Conclusions

Despite weak convergent validity, the ADDQoL-19 was found to have a satisfactory psychometric property, especially known-group comparisons and internal consistency reliability in the primary care setting.

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Abbreviations

DM:

Diabetes mellitus

HRQOL:

Health-related quality of life

ADDQoL-19:

19-item Audit of Diabetes-Dependent Quality of Life

BMI:

Body mass index

QOL:

Quality of life

AWI:

Average weight impact

WI:

Weight impact

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Acknowledgments

This study was supported by the Seed Funding Programme for Basic Research (Project Code: 201102159001) of the University of Hong Kong. Thanks also go to Mr Anca Chan for statistical assistance and Ms Mansy Sham for technical editing.

Author contributions

C. F. and C. W. provided direct input into the design and execution of the study. C. W. and Y. F. W. undertook statistical analysis and generated the results. C. F., C. W., C. Y. and Y. F. W. drafted the manuscript. All authors contributed to its editing. All authors read and approved the final manuscript.

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Authors and Affiliations

  1. Department of Family Medicine and Primary Care, The University of Hong Kong, 3/F, Ap Lei Chau Clinic, 161 Ap Lei Chau Main Street, Ap Lei Chau, Hong Kong

    Colman S. C. Fung, Eric Y. F. Wan, Charlotte L. Y. Yu & Carlos K. H. Wong

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  1. Colman S. C. Fung
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  2. Eric Y. F. Wan
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  3. Charlotte L. Y. Yu
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  4. Carlos K. H. Wong
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Correspondence to Carlos K. H. Wong.

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Fung, C.S.C., Wan, E.Y.F., Yu, C.L.Y. et al. Validity and reliability of the 19-item Audit of Diabetes-Dependent Quality of Life (ADDQoL-19) questionnaire in Chinese patients with type 2 diabetes mellitus in primary care. Qual Life Res 25, 2373–2378 (2016). https://doi.org/10.1007/s11136-016-1263-0

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