Quality of life in low-income patients with metastatic prostate cancer: Divergent and convergent validity of three instruments

L. K. Sharp; S. J. Knight; R. Nadler; M. Albers; E. Moran; T. Kuzel; R. Sharifi; C. Bennett

doi:10.1023/A:1008940015696

Quality of life in low-income patients with metastatic prostate cancer: Divergent and convergent validity of three instruments

L. K. Sharp^*, S. J. Knight, R. Nadler, M. Albers, E. Moran, T. Kuzel, R. Sharifi, C. Bennett

^*Corresponding author for this work

Urology

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Few studies have evaluated Quality Of Life (QOL) among low-income patients with cancer. Information is needed about the feasibility and psychometric characteristics of QOL instruments in these populations. The purpose of this study was to examine the convergent and discriminant relationships between scales of three QOL instruments: European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC), Functional Assessment of Cancer Therapy - General (FACT), and Quality of Life Index (QLI). Participants included 110 men with metastatic prostate cancer of whom 94% were low income and 62% were African-American. Interviewers administered the questionnaires. Cronbach α internal consistency reliabilities were 0.57 to 0.90 for the EORTC, 0.65 to 0.86 for the FACT, and 0.63 for the QLI. Convergent validity was supported for the EORTC and FACT scales measuring emotional, physical, and role/functional dimensions (r = 0.54 to 0.72), but not on scales measuring social function (r = 0.12). Divergent validity was supported between dissimilar scales (r = 0.14 to 0.38). Analysis with receiver operating characteristics curves provided empirical support for the EORTC and FACT as multidimensional measures. These findings suggest that, even in busy clinical settings with low literacy patients, interviewer-administered EORTC and FACT QOL instruments can provide valid and reliable information.

Original language	English (US)
Pages (from-to)	461-470
Number of pages	10
Journal	Quality of Life Research
Volume	8
Issue number	5
DOIs	https://doi.org/10.1023/A:1008940015696
State	Published - 1999

Funding

This research was funded by a grant from Schering-Plough Division of Outcomes Research. The authors would like to express their appreciation to Sharon Waller, Kristin Flynn, and Jill Smith for their assistance in data collection, to John Vessey, Ph.D. for statistical assistance, and to the men who participated in this study.

Keywords

Blacks
Metastatic disease
Prostatic neoplasms
Quality of life
Socioeconomic factors

ASJC Scopus subject areas

Public Health, Environmental and Occupational Health

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1023/A:1008940015696

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title = "Quality of life in low-income patients with metastatic prostate cancer: Divergent and convergent validity of three instruments",

abstract = "Few studies have evaluated Quality Of Life (QOL) among low-income patients with cancer. Information is needed about the feasibility and psychometric characteristics of QOL instruments in these populations. The purpose of this study was to examine the convergent and discriminant relationships between scales of three QOL instruments: European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC), Functional Assessment of Cancer Therapy - General (FACT), and Quality of Life Index (QLI). Participants included 110 men with metastatic prostate cancer of whom 94% were low income and 62% were African-American. Interviewers administered the questionnaires. Cronbach α internal consistency reliabilities were 0.57 to 0.90 for the EORTC, 0.65 to 0.86 for the FACT, and 0.63 for the QLI. Convergent validity was supported for the EORTC and FACT scales measuring emotional, physical, and role/functional dimensions (r = 0.54 to 0.72), but not on scales measuring social function (r = 0.12). Divergent validity was supported between dissimilar scales (r = 0.14 to 0.38). Analysis with receiver operating characteristics curves provided empirical support for the EORTC and FACT as multidimensional measures. These findings suggest that, even in busy clinical settings with low literacy patients, interviewer-administered EORTC and FACT QOL instruments can provide valid and reliable information.",

keywords = "Blacks, Metastatic disease, Prostatic neoplasms, Quality of life, Socioeconomic factors",

author = "Sharp, {L. K.} and Knight, {S. J.} and R. Nadler and M. Albers and E. Moran and T. Kuzel and R. Sharifi and C. Bennett",

note = "Funding Information: This research was funded by a grant from Schering-Plough Division of Outcomes Research. The authors would like to express their appreciation to Sharon Waller, Kristin Flynn, and Jill Smith for their assistance in data collection, to John Vessey, Ph.D. for statistical assistance, and to the men who participated in this study.",

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T2 - Divergent and convergent validity of three instruments

AU - Sharp, L. K.

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AU - Nadler, R.

AU - Albers, M.

AU - Moran, E.

AU - Kuzel, T.

AU - Sharifi, R.

AU - Bennett, C.

N1 - Funding Information: This research was funded by a grant from Schering-Plough Division of Outcomes Research. The authors would like to express their appreciation to Sharon Waller, Kristin Flynn, and Jill Smith for their assistance in data collection, to John Vessey, Ph.D. for statistical assistance, and to the men who participated in this study.

PY - 1999

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N2 - Few studies have evaluated Quality Of Life (QOL) among low-income patients with cancer. Information is needed about the feasibility and psychometric characteristics of QOL instruments in these populations. The purpose of this study was to examine the convergent and discriminant relationships between scales of three QOL instruments: European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC), Functional Assessment of Cancer Therapy - General (FACT), and Quality of Life Index (QLI). Participants included 110 men with metastatic prostate cancer of whom 94% were low income and 62% were African-American. Interviewers administered the questionnaires. Cronbach α internal consistency reliabilities were 0.57 to 0.90 for the EORTC, 0.65 to 0.86 for the FACT, and 0.63 for the QLI. Convergent validity was supported for the EORTC and FACT scales measuring emotional, physical, and role/functional dimensions (r = 0.54 to 0.72), but not on scales measuring social function (r = 0.12). Divergent validity was supported between dissimilar scales (r = 0.14 to 0.38). Analysis with receiver operating characteristics curves provided empirical support for the EORTC and FACT as multidimensional measures. These findings suggest that, even in busy clinical settings with low literacy patients, interviewer-administered EORTC and FACT QOL instruments can provide valid and reliable information.

AB - Few studies have evaluated Quality Of Life (QOL) among low-income patients with cancer. Information is needed about the feasibility and psychometric characteristics of QOL instruments in these populations. The purpose of this study was to examine the convergent and discriminant relationships between scales of three QOL instruments: European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC), Functional Assessment of Cancer Therapy - General (FACT), and Quality of Life Index (QLI). Participants included 110 men with metastatic prostate cancer of whom 94% were low income and 62% were African-American. Interviewers administered the questionnaires. Cronbach α internal consistency reliabilities were 0.57 to 0.90 for the EORTC, 0.65 to 0.86 for the FACT, and 0.63 for the QLI. Convergent validity was supported for the EORTC and FACT scales measuring emotional, physical, and role/functional dimensions (r = 0.54 to 0.72), but not on scales measuring social function (r = 0.12). Divergent validity was supported between dissimilar scales (r = 0.14 to 0.38). Analysis with receiver operating characteristics curves provided empirical support for the EORTC and FACT as multidimensional measures. These findings suggest that, even in busy clinical settings with low literacy patients, interviewer-administered EORTC and FACT QOL instruments can provide valid and reliable information.

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KW - Socioeconomic factors

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Quality of life in low-income patients with metastatic prostate cancer: Divergent and convergent validity of three instruments

Abstract

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

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