Abstract
Purpose
The objective of this study is to evaluate the longitudinal construct validity of the Health Utilities Index Mark 2 (HUI2) and Health Utilities Index Mark 3 (HUI3) using a convergent/divergent validity approach in patients recovering from hip fracture, with the Functional Independence Measure (FIM) as the comparator.
Methods
A total of 278 patients with a primary diagnosis of hip fracture were interviewed 3–5 days after surgery and then at 1 and 6 months using the HUI2, HUI3 and the FIM and a Likert-type rating of hip pain. A priori hypotheses were formulated. Convergent and divergent correlations between HUI2, HUI3 and FIM change scores for the baseline to 1-month and baseline to 6-month intervals were examined.
Results
Overall HUI2 detected continued gain in health-related quality of life between 1 and 6 months after fracture, as the change increased from 0.20 to 0.29 units. The correlation between change in the overall HUI2 score and total FIM score was moderate (r = 0.50) over the 6-month interval, but larger than the observed correlation over the 1-month interval (r = 0.36). The correlation between change in overall HUI3 score and total FIM over the 1-month interval was small (r = 0.32), and the correlation between change in overall HUI3 score and total FIM was moderate (r = 0.37) over the 6-month interval. All hypotheses for the divergent correlations were supported.
Conclusions
Weaker correlations were reported for change over 1 month as compared to change over the 6 months after fracture. Findings supported the longitudinal construct validity of the overall HUI2 and HUI3 for the assessment of recovery following hip fracture, particularly for change over the 6 months following fracture.
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Acknowledgments
Dr. Jones was supported by postdoctoral fellowships from the Canadian Institutes of Health Research and Alberta Heritage Foundation for Medical Research when this research was conducted. Dr. Pohar contributed to this work while on leave from Canadian Agency for Drugs and Technologies in Health (CADTH). As such, the views presented in this article do not necessarily represent the views of CADTH.
This research project was supported by grants from Institute of Health Economics, University of Alberta Hospital Foundation, Royal Alexandra Hospital Foundation, Edmonton Orthopaedic Research Trust, and Alberta Heritage Foundation for Medical Research. These funding agencies played no role in the design, interpretation or analysis of the project reported here and have not reviewed or approved this manuscript.
We would like to express our gratitude toward the patients and their family caregivers for their interest and participation in this study. We are also grateful to the University of Alberta Hospital Orthopaedics Research Office for their assistance in patient recruitment and data collection. The authors also acknowledge the constructive comments provided by the reviewers and the editor.
Conflict of interest
It should be noted that David Feeny has a proprietary interest in Health Utilities Incorporated, Dundas, Ontario, Canada. HUInc. owns the copyright to and distributes HUI materials.
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Jones, C.A., Pohar, S.L., Feeny, D.H. et al. Longitudinal construct validity of the Health Utilities Indices Mark 2 and Mark 3 in hip fracture. Qual Life Res 23, 805–813 (2014). https://doi.org/10.1007/s11136-013-0531-5
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DOI: https://doi.org/10.1007/s11136-013-0531-5