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Quality of Life Research

, Volume 21, Issue 7, pp 1267–1278 | Cite as

Psychometric evaluation of the Cystic Fibrosis Questionnaire-Revised in a national sample

  • Alexandra L. Quittner
  • Gregory S. Sawicki
  • Ann McMullen
  • Lawrence Rasouliyan
  • David J. Pasta
  • Ashley Yegin
  • Michael W. Konstan
Article

Abstract

Purpose

The psychometric properties of a health-related quality of life (HRQOL) instrument, the Cystic Fibrosis Questionnaire-Revised (CFQ-R), were evaluated in a national sample of patients with cystic fibrosis (CF).

Methods

The Epidemiologic Study of CF is a national, multicenter, longitudinal cohort study containing CFQ-R and health outcomes data. Developmentally appropriate versions of the CFQ-R were available from 7,330 patients aged 6–70 years and a proxy version from 2,728 parents of school-age children. The CFQ-R was completed during a “stable” or “sick” visit before recording health outcomes such as weight, lung function, and pulmonary exacerbations.

Results

There were few floor and ceiling effects and strong internal consistency (Cronbach alpha ≥0.70) for most scales. The CFQ-R consistently discriminated between patients seen for sick-versus-well visits, and among stages of disease severity based on lung function. As predicted, women with CF reported worse HRQOL than men on scales not related to body image and weight. Strong parent–child agreement was found on scales measuring observable behaviors (respiratory symptoms). Convergence between CFQ-R scales and health outcomes provided evidence of construct validity.

Conclusions

The CFQ-R demonstrated robust psychometric properties and consistent associations with health outcomes in a large national sample.

Keywords

Cystic fibrosis Health-related quality of life Psychometric properties Patient-reported outcomes 

Abbreviations

ANOVA

Analysis of variance

BMI

Body mass index

CF

Cystic fibrosis

CFQ-R

Cystic Fibrosis Questionnaire-Revised

ESCF

Epidemiologic Study of Cystic Fibrosis

FEV1

Forced expiratory volume in 1 s

HRQOL

Health-related quality of life

IV

Intravenous

MID

Minimal important difference

PRO

Patient-reported outcome

SF-36

36-Item Short Form Health Survey

Notes

Acknowledgments

All sources of support for the ESCF in the form of grants, case report forms, and data analysis were provided by Genentech, Inc., South San Francisco, California.

Conflict of interest

This study is sponsored by Genentech, Inc. Alexandra Quittner, Greg Sawicki, Ann McMullen, and Michael Konstan have received honoraria from Genentech for serving as members of the Scientific Advisory Group for the Epidemiologic Study of Cystic Fibrosis (ESCF). Alexandra Quittner and Michael Konstan have served as consultants to Genentech. No compensation was provided to these authors in exchange for the production of this manuscript. Lawrence Rasouliyan and David Pasta are employees of ICON Late Phase & Outcomes Research, which was paid by Genentech for providing analytical services for this study. Ashley Yegin is an employee of Genentech.

Supplementary material

11136_2011_36_MOESM1_ESM.pdf (96 kb)
Supplementary material 1 (PDF 95 kb)

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Alexandra L. Quittner
    • 1
  • Gregory S. Sawicki
    • 2
  • Ann McMullen
    • 3
  • Lawrence Rasouliyan
    • 4
  • David J. Pasta
    • 4
  • Ashley Yegin
    • 5
  • Michael W. Konstan
    • 6
  1. 1.University of MiamiMiamiUSA
  2. 2.Children’s Hospital BostonBostonUSA
  3. 3.University of Rochester Medical CenterRochesterUSA
  4. 4.ICON Late Phase and Outcomes ResearchSan FranciscoUSA
  5. 5.Genentech, Inc.South San FranciscoUSA
  6. 6.Rainbow Babies and Children’s Hospital and Case Western Reserve University School of MedicineClevelandUSA

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