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Health and Quality of Life Outcomes
Published in: Health and Quality of Life Outcomes 1/2016

Open Access 01-12-2016 | Research

The COPD-SIB: a newly developed disease-specific item bank to measure health-related quality of life in patients with chronic obstructive pulmonary disease

Authors: Muirne C. S. Paap, Lonneke I. M. Lenferink, Nadine Herzog, Karel A. Kroeze, Job van der Palen

Published in: Health and Quality of Life Outcomes | Issue 1/2016

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Abstract

Background

Health-related quality of life (HRQoL) is widely used as an outcome measure in the evaluation of treatment interventions in patients with chronic obstructive pulmonary disease (COPD). In order to address challenges associated with existing fixed-length measures (e.g., too long to be used routinely, too short to ensure both content validity and reliability), a COPD-specific item bank (COPD-SIB) was developed.

Methods

Items were selected based on literature review and interviews with Dutch COPD patients, with a strong focus on both content validity and item comprehension. The psychometric quality of the item bank was evaluated using Mokken Scale Analysis and parametric Item Response Theory, using data of 666 COPD patients.

Results

The final item bank contains 46 items that form a strong scale, tapping into eight important themes that were identified based on literature review and patient interviews: Coping with disease/symptoms, adaptability; Autonomy; Anxiety about the course/end-state of the disease, hopelessness; Positive psychological functioning; Situations triggering or enhancing breathing problems; Symptoms; Activity; Impact.

Conclusions

The 46-item COPD-SIB has good psychometric properties and content validity. Items are available in Dutch and English. The COPD-SIB can be used as a stand-alone instrument, or to inform computerised adaptive testing.
Appendix
Available only for authorised users
Footnotes
1
The total number of items equaled 211: 148 for the 3 generic domains and 63 for the COPD-SIB.
 
2
An informal feasibility study indicated that patients felt that completing up to 100 items was acceptable (n = 4; data not shown).
 
3
As mentioned previously, three items (items 6, 7 and 8) were excluded prior to analysis since they had >20 % missing values.
 
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Metadata
Title
The COPD-SIB: a newly developed disease-specific item bank to measure health-related quality of life in patients with chronic obstructive pulmonary disease
Authors
Muirne C. S. Paap
Lonneke I. M. Lenferink
Nadine Herzog
Karel A. Kroeze
Job van der Palen
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Health and Quality of Life Outcomes / Issue 1/2016
Electronic ISSN: 1477-7525
DOI
https://doi.org/10.1186/s12955-016-0500-0

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