A comparison of the FACT-G and the Supportive Care Needs Survey (SCNS) in women with ovarian cancer: Unidimensionality of constructs

Colagiuri, B; King, MT; Butow, PN; McGrane, JA; Luckett, T; Price, MA; Birney, DP

A comparison of the FACT-G and the Supportive Care Needs Survey (SCNS) in women with ovarian cancer: Unidimensionality of constructs

Colagiuri, B King, MT Butow, PN McGrane, JA Luckett, T

Price, MA Birney, DP

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Publication Type:: Journal Article
Citation:: Quality of Life Research, 2012, 21 (5), pp. 887 - 897
Issue Date:: 2012-06-01

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Field	Value	Language
dc.contributor.author	Colagiuri, B	en_US
dc.contributor.author	King, MT	en_US
dc.contributor.author	Butow, PN	en_US
dc.contributor.author	McGrane, JA	en_US
dc.contributor.author	Luckett, T https://orcid.org/0000-0001-6121-5409	en_US
dc.contributor.author	Price, MA	en_US
dc.contributor.author	Birney, DP	en_US
dc.date.available	2011-08-08	en_US
dc.date.issued	2012-06-01	en_US
dc.identifier.citation	Quality of Life Research, 2012, 21 (5), pp. 887 - 897	en_US
dc.identifier.issn	0962-9343	en_US
dc.identifier.uri	http://hdl.handle.net/10453/21995
dc.description.abstract	Purpose: Health-related quality of life (HRQoL) and unmet needs (needs) questionnaires offer alternative perspectives for assessing cancer patients' concerns. We examined whether the conceptual differences underlying these alternative approaches yield corresponding empirical differences. Methods: Eight-hundred and seventy-four women with ovarian cancer completed the Functional Assessment of Cancer Therapy scale (FACT-G; HRQoL) and the Supportive Care Needs Survey (SCNS-SF34; needs) every 3 months for 2 years. Correlational analysis, exploratory and confirmatory factor analysis (EFA/CFA), and Rasch analysis tested the relationship between patients' responses to similar domains and similar items across the two questionnaires. Results: Strong correlations were found between items with virtually identical wording (0.67-0.75), while moderate to strong correlations (0.55-0.65) were found for those with very similar wording. EFA identified two common domains across the two questionnaires: physical and psychological. For each common domain, CFA indicated models involving a single construct with systematic variation within each questionnaire fit best. Rasch analysis including very similar items within the physical and psychological domains (separately) demonstrated strong evidence of unidimensionality. Conclusions: The high degree of similarity between patient responses to items addressing the same or very similar concerns suggests either that HRQoL and needs approaches do not reflect different constructs or that patients may not be able to differentiate between the severity of a concern and the level of need associated with that concern, especially when these are assessed in quick succession. © Springer Science+Business Media B.V. 2011.	en_US
dc.relation.ispartof	Quality of Life Research	en_US
dc.relation.isbasedon	10.1007/s11136-011-9993-5	en_US
dc.subject.classification	Health Policy & Services	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Ovarian Neoplasms	en_US
dc.subject.mesh	Health Surveys	en_US
dc.subject.mesh	Factor Analysis, Statistical	en_US
dc.subject.mesh	Chi-Square Distribution	en_US
dc.subject.mesh	Reproducibility of Results	en_US
dc.subject.mesh	Psychometrics	en_US
dc.subject.mesh	Quality of Life	en_US
dc.subject.mesh	Middle Aged	en_US
dc.subject.mesh	Women's Health	en_US
dc.subject.mesh	Health Services Needs and Demand	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Statistics as Topic	en_US
dc.title	A comparison of the FACT-G and the Supportive Care Needs Survey (SCNS) in women with ovarian cancer: Unidimensionality of constructs	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	21	en_US
utslib.for	1402 Applied Economics	en_US
utslib.for	1117 Public Health and Health Services	en_US
utslib.for	1701 Psychology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Business
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Faculty of Health/IMPACCT
utslib.copyright.status	closed_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	21	en_US

Abstract:

Purpose: Health-related quality of life (HRQoL) and unmet needs (needs) questionnaires offer alternative perspectives for assessing cancer patients' concerns. We examined whether the conceptual differences underlying these alternative approaches yield corresponding empirical differences. Methods: Eight-hundred and seventy-four women with ovarian cancer completed the Functional Assessment of Cancer Therapy scale (FACT-G; HRQoL) and the Supportive Care Needs Survey (SCNS-SF34; needs) every 3 months for 2 years. Correlational analysis, exploratory and confirmatory factor analysis (EFA/CFA), and Rasch analysis tested the relationship between patients' responses to similar domains and similar items across the two questionnaires. Results: Strong correlations were found between items with virtually identical wording (0.67-0.75), while moderate to strong correlations (0.55-0.65) were found for those with very similar wording. EFA identified two common domains across the two questionnaires: physical and psychological. For each common domain, CFA indicated models involving a single construct with systematic variation within each questionnaire fit best. Rasch analysis including very similar items within the physical and psychological domains (separately) demonstrated strong evidence of unidimensionality. Conclusions: The high degree of similarity between patient responses to items addressing the same or very similar concerns suggests either that HRQoL and needs approaches do not reflect different constructs or that patients may not be able to differentiate between the severity of a concern and the level of need associated with that concern, especially when these are assessed in quick succession. © Springer Science+Business Media B.V. 2011.

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http://hdl.handle.net/10453/21995