Controlling for occasion-specific effects when assessing the test-retest reliability of self-report health questionnaires.

Controlling for occasion-specific effects when assessing the test-retest reliability of self-report health questionnaires. Research Abstract Details 

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Controlling for occasion-specific effects when assessing the test-retest reliability of self-report health questionnaires. Abstract Text:

Joseph A Olsen,Daniel A Bloch,George J Bloch,Joseph A Olsen,Daniel A Bloch,George J Bloch,

OBJECTIVE: This study proposes a method for self-report health questionnaires to adjust test-retest reliability for changes during the test-retest interval based on an external measure, and to distinguish such changes from random response errors. METHODS: In our application, eighty participants completed the Symptoms of Illness Checklist (SIC) on two occasions, two weeks apart, immediately before interviews given on each occasion by one of two physicians in a crossover design. The physician interview scores served as external measures, and structural equation modeling was used to estimate the parameters of a model that corrected for the occasion-specific effect of participants' responses using information from the interviews. RESULTS: Correcting for changes in symptoms during the test-retest interval increased SIC test-retest reliability from .744 to .804 and significantly improved model fit (chi2(diff)(1) = 30.78, p < .001). CONCLUSIONS: The results suggest methods that can improve the evaluation of self-report health questionnaire test-retest reliability by identifying changes using an external measure, and distinguishing these from random response errors; these increased the estimated SIC test-retest reliability and indicated that the SIC was indeed able to measure changes over the studied time interval. This method can be applied across a broad range of questionnaires.

Controlling for occasion-specific effects when assessing the test-retest reliability of self-report health questionnaires. Publishing Authors By Initials

JA Olsen,DA Bloch,GJ Bloch,JA Olsen,DA Bloch,GJ Bloch,

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Controlling for occasion-specific effects when assessing the test-retest reliability of self-report health questionnaires. Journal Published:

PUBLICATION TYPE: Validation Studies

Journal: Quality of life research : an international journa

VOLUME: 16

Page Numbers: 1399-405

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ISSN: 0962-9343

DAY: 31

MONTH: 07

YEAR: 2007

Controlling for occasion-specific effects when assessing the test-retest reliability of self-report health questionnaires. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Controlling for occasion-specific effects when assessing the test-retest reliability of self-report health questionnaires.

AFFILIATION: College of Family, Home and Social Sciences, Brigham Young University, Provo, UT, USA.

Country: Netherlands

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MEDLINETA: Qual Life Res

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