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Qual Life Res. 2008 Feb;17(1):147-57. Epub 2007 Nov 16.

Measuring quality of life among cervical cancer survivors: preliminary assessment of instrumentation validity in a cross-cultural study.

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1
Center of Community Alliance for Research and Education (CCARE), Division of Population Sciences, City of Hope National Medical Center, Duarte, CA, USA.

Abstract

BACKGROUND:

With growing interest in cross-cultural and multicultural cancer-related quality of life studies, the need to assess reliability and validity of quality of life measures for linguistically and culturally diverse cancer survivors is pressing.

METHODS:

Reliability and validity of the English and Spanish versions of the Functional Assessment of Cancer Therapy (FACT)-G subscales were tested with a sample of English-speaking European American (n = 273) and ethnic minority American (n = 194), and Spanish-speaking Latina (n = 199) cervical cancer survivors in the U.S.

RESULTS:

Reliability coefficients (Cronbach's alpha) were 0.76 or higher across ethnic/linguistic groups except for the emotional wellbeing subscale among Spanish-speaking Latinas (alpha = 0.64). Factor analyses demonstrated overall measurement equivalence across groups with some ethnic/linguistic variations: there were greater differences between linguistic groups than between ethnic groups. Additionally, the scale's factor structure was less satisfactory for Spanish-speaking Latinas. The subscales had good concurrent validity with appropriate subscales of the Short Form (SF)-12 and Rand/SF-36 General Health subscale (Pearson's r 0.53-0.66), suggesting each subscale was assessing its intended construct.

CONCLUSION:

The overall psychometric properties of the FACT-G were cross-culturally equivalent. However, more validation studies are needed for non-English speaking populations particularly with emotional wellbeing. In addition, disaggregated analyses on linguistic groups are recommended unless cross-cultural equivalence is established.

PMID:
18008184
DOI:
10.1007/s11136-007-9276-3
[Indexed for MEDLINE]
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