Cited by 272Cystic Fibrosis Research AdvancesHealth Education and ValidationHealth Systems, Economic Evaluations, Quality of Life

Development of a disease specific health related quality of life measure for adults and adolescents with cystic fibrosis

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Gee, L·2000·Thorax

Abstract

BACKGROUND: Health related quality of life (HRQoL) measurement is important in determining the impact of disease on daily functioning and subsequently informing interventions. In cystic fibrosis (CF) generic HRQoL measures have been employed but these may not be sufficiently specific. The aim of the current work was to develop and validate a disease specific HRQoL measure for adults and adolescents with cystic fibrosis. METHODS: Areas of concern to adults and adolescents with CF were identified by unstructured interviews, self-administered questionnaires, consultation with multidisciplinary specialist staff, a review of the relevant literature, and examination of other HRQoL measures. Items for the questionnaire were generated on the basis of this process. Continued evaluation and development of the Cystic Fibrosis Quality of Life (CFQoL) questionnaire was undertaken by a process of statistical analysis and continued feedback from patients. The full testing and validation of the CFQoL questionnaire took place over four phases: (1) initial item generation and testing of a preliminary questionnaire, (2) testing and validation of the second version of the questionnaire, (3) test-retest reliability of a third and final version of the questionnaire, and (4) sensitivity testing of the final version of the questionnaire. RESULTS: Nine domains of functioning were identified using principal components analysis with varimax rotation. Internal reliability of the identified domains was demonstrated using Cronbach alpha coefficients (range 0.72-0.92) and item to total domain score correlations. Concurrent validity (range r = 0.64-0.74), discriminatory ability between different levels of disease severity, sensitivity across transient changes in health (effect size range, moderate d = 0.56 to large d = 1.95), and test-retest reliability (r = 0.74-0.96) were also found to be robust. CONCLUSIONS: The CFQoL questionnaire is a fully validated disease specific measure consisting of 52 items across nine domains of functioning which have been identified by, and are of importance to, adolescents and adults with cystic fibrosis. This measure will be useful in clinical trials and longitudinal studies.

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  1. Weir DC, Freeman W, Roberts KT, et al. Comparison of the measure of quality of life in patients with cystic fibrosis (CF) and chronic airflow obstruction (CAO). Thorax 1991;46:288.
  2. Abbott J, Dodd M, Webb AK. Coping styles and treatment adherence in adults with cystic fibrosis. 21st European Cystic Fibrosis Conference, Davos, Switzerland, 1997.
  3. Brazier JE, Harper R, Jones NMB, et al. Validating the SF36 health survey questionnaire: new outcome measure for pri- mary care. BMJ 1992;305:160-4.
  4. Jenkinson C, Wright L, Coulter A. Quality of life measurement in health care. A review of measures and population norms for the UK SF-36. Health Services Research Unit, 1993.
  5. Mechanic D. Sex, illness, illness behaviour and the use of health services. Soc Sci Med 1978;128:207-14.

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Authors
Gee, L.
Affiliations
University of Lancashire (GB)
Corresponding author
Gee, L
Venue
Thorax
Publisher
BMJ
Published
2000-11-01
Volume
55
Issue
11
Pages
946-954
ISSN
0040-6376 (ISSN-L)
OpenAlex
W2142930532
Cited by
272
References
24
Citations by year
2026: 3 · 2025: 8 · 2024: 7 · 2023: 8 · 2022: 10 · 2021: 12 · 2020: 14 · 2019: 9 · 2018: 13 · 2017: 9 · 2016: 12 · 2015: 18 · 2014: 16 · 2013: 10 · 2012: 16
FWCI
4.78
Type
journal article
Language
en
Open access
Locations
  • Thorax (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Cystic Fibrosis Research Advances
  • Social Sciences › Education › Health Education and Validation
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Health Systems, Economic Evaluations, Quality of Life
Keywords
cystic fibrosis, health-related quality of life, disease-specific questionnaire, questionnaire development, questionnaire validation, adolescents, adults, test-retest reliability, sensitivity to change, concurrent validity, item generation
MeSH terms
Adolescent, Adult, Cystic Fibrosis, Female, Health Status, Humans, Life Style, Male, Middle Aged, Quality of Life, Surveys and Questionnaires, Sensitivity and Specificity, Reproducibility of Results

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