Reliability across studies from the functional assessment of cancer therapy-general (FACT-G) and its subscales: A reliability generalization

David E Victorson*, Joshua Barocas, Juliette Song, David Cella

*Corresponding author for this work

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

Purpose: The aim of this study was to conduct a reliability generalization of the Functional Assessment of Cancer Therapy-General (FACT-G) and its subscales to examine variation in score reliability across all published studies. Methods: We reviewed 344 publications based on predetermined criteria. About 78 published studies reported Cronbach's Alpha reliability coefficients from their study in which data were collected. Sample size based weights were applied, and studies were coded on several scale and demographic characteristics. Using independent samples t tests, we examined associations between study characteristics and internal consistency variability. Results: Average FACT-G score reliability was .88 (subscales ranged between .71-.83). Three variables produced small, statistically significant (P ≤ .05) eta squared effects (ranging between .06-.21) due to different sources of variation in the FACT-G and subscales: ethnicity, cancer type, and study type-all of which appeared to be related to disproportionate representation of studies with the majority including Caucasian samples, mixed cancer samples, and validation type studies. Conclusions: The FACT-G and its subscales demonstrated acceptable reliability evidence across observed studies, without substantial variability due to scale or demographic characteristics.

Original languageEnglish (US)
Pages (from-to)1137-1146
Number of pages10
JournalQuality of Life Research
Volume17
Issue number9
DOIs
StatePublished - Nov 1 2008

Keywords

  • Patient outcome assessment
  • Quality of life
  • Reliability of results

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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