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Properties of the 15D and the Nottingham Health Profile questionnaires in patients with lower limb atherosclerotic disease

Published online by Cambridge University Press:  19 June 2007

Kirsi Koivunen ,
Harri Sintonen  and
Hannele Lukkarinen
Kirsi Koivunen
Affiliation:
University of Oulu
Harri Sintonen
Affiliation:
University of Helsinki
Hannele Lukkarinen
Affiliation:
University of Oulu
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Abstract

Objectives: The aim of this study was to compare the generic health-related quality of life (HRQoL) instruments, the 15D and the Nottingham Health Profile (NHP), in terms of feasibility, cross-sectional construct validity, discriminatory power, and responsiveness to the change in patients with lower limb atherosclerosis disease (LLAD).

Methods: Patients who were treated conservatively (64 patients), scheduled for endovascular treatment (85 patients), or for elective surgery (31 patients) filled in the NHP and the 15D questionnaires before treatment and 12 months after. The methods of analysis included calculations of the completion rate, the multitrait–multimethod matrix, extreme group comparisons with the t-test, and calculations of “floor” and “ceiling” effects and effect sizes.

Results: Both the 15D and the NHP instruments were feasible because full data were obtained at baseline from 84.1 percent of patients and 82 percent at 12 months with the 15D and, respectively, 75.8 percent and 79 percent with the NHP. The multitrait–multimethod matrix and extreme group comparisons provided a clear convergent and discriminant evidence of the cross-sectional construct validity of the instruments. The convergent validity correlations were quite high, ranging between .40 and .682. The tendency for higher percentages at the “ceiling” and “floor” for the NHP suggests that it has less discriminatory power than the 15D on roughly comparable dimensions. The 15D and the NHP were almost equally responsive to change.

Conclusions: This study provided evidence that both the 15D and the NHP are appropriate for measuring HRQoL among patients with LLAD.

Keywords

Psychometric propertiesHealth-related quality of life instrumentsLower limb atherosclerotic disease
Type
GENERAL ESSAYS
Information
International Journal of Technology Assessment in Health Care , Volume 23 , Issue 3 , July 2007 , pp. 385 - 391
Copyright
© 2007 Cambridge University Press

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