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Psychometric properties of the Norwegian version of the Audit of Diabetes-Dependent Quality of Life

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Abstract

Purpose

To examine the psychometric properties of the Norwegian version of the Audit of Diabetes-Dependent Quality of Life version 18 (ADDQoL-18).

Methods

We assessed the reliability (Cronbach’s alpha and intraclass correlations) and construct validity (confirmatory factor analysis and Pearson’s correlation coefficients) of the instrument in a sample of 292 adults in Norway aged 42.3 (SD 14.2) years.

Results

Internal consistency (Cronbach’s alpha 0.88) and 4-week test–retest stability (intraclass correlations = 0.87) were satisfactory. Confirmatory factor analysis indicated that the one-factor structure of the ADDQoL-18 fits moderately (χ 2/df ratio = 3.846, comparative fit index = 0.792, root mean square error of approximation = 0.099). Standardized coefficients showed that all domains loaded >0.4, except for one item. We found a satisfactory correlation between the ADDQoL-18 and the SF-36 Health Survey summary scales (physical health and mental health summary scales) and the Hospital Anxiety and Depression Scale. The total score was negatively associated with HbA1c (r = −0.18; P < 0.002), indicating that lower scores on the ADDQoL-18 were related to poorer glycemic control. Analysis regarding discriminant validity showed that the average weighted impact scores were mostly reduced among those reporting neuropathy and foot problems.

Conclusions

The Norwegian version of the ADDQoL-18 showed high internal consistency, good test–retest reliability, and similar construct validity as the original instrument. Overall, the results supported the ADDQoL-18 being feasible for use in Norway.

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Fig. 1

Abbreviations

ADDQoL:

Audit of Diabetes-Dependent Quality of Life

AWI:

Average weighted impact scores

CI:

Confidence interval

Df:

Degrees of freedom

HADS:

Hospital Anxiety Depression Scale

HbA1c :

Glycosylated hemoglobin

HRQoL:

Health-related quality of life

ICC:

Intraclass correlation

QoL:

Quality of life

SD:

Standard deviation

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Acknowledgments

We thank the patients for their kind participation in the study and the nurses at the ward, Ingvild Hernar, Kari Horn, Elisabeth Iversen, Berit M. Tarlebø and Elin Irrborg, for their dedicated participation in data collection. Bergen University College and the University of Bergen, Norway, kindly supported this research.

Conflict of interest

None.

Author information

Authors and Affiliations

  1. Centre for Evidence-Based Practice, Bergen University College, Postbox 7030, 5020, Bergen, Norway

    Marjolein M. Iversen, Birgitte Espehaug, Anne Haugstvedt & Marit Graue

  2. Section of Endocrinology, Department of Medicine, Stavanger University Hospital, Stavanger, Norway

    Marjolein M. Iversen

  3. Department of Public Health and Primary Health Care, University of Bergen, Bergen, Norway

    Berit Rokne

  4. Department of Research and Development, Haukeland University Hospital, Bergen, Norway

    Berit Rokne

  5. Department of Pediatrics, Haukeland University Hospital, Bergen, Norway

    Marit Graue

Authors
  1. Marjolein M. Iversen
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  2. Birgitte Espehaug
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  3. Berit Rokne
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  4. Anne Haugstvedt
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  5. Marit Graue
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Correspondence to Marjolein M. Iversen.

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Iversen, M.M., Espehaug, B., Rokne, B. et al. Psychometric properties of the Norwegian version of the Audit of Diabetes-Dependent Quality of Life. Qual Life Res 22, 2809–2812 (2013). https://doi.org/10.1007/s11136-013-0413-x

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  • DOI: https://doi.org/10.1007/s11136-013-0413-x

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