PMID: 11934372Apr 6, 2002Paper

The test-retest reliability of the modified Patient Generated Index

Journal of Health Services Research & Policy
Mary Tully, Judith Cantrill

Abstract

The purpose of this study was to determine the test-retest reliability of the recently modified Patient Generated Index (PGI) when used as a self-completed postal questionnaire by older people with arthritis. Two sets of postal questionnaires were used, sent two weeks apart, followed by interviews with a theoretically chosen subsample of respondents to both. Reliability for respondents whose health had not changed in the intervening two weeks was assessed using intraclass correlation coefficients. Data from interviews were used to develop theories to select subgroups for analysis. One thousand one hundred and twenty-nine people over 65 years old with arthritis were surveyed and 53 were selected for interview. The response rates to the two surveys were 78% and 83%, respectively. Complete data for the test-retest analysis were available from 236 (29.2%) respondents. The intraclass correlation coefficient (r(i)) was 0.55 [95% confidence interval (CI) 0.43 to 0.64, P < 0.0001]. The most optimistic range for the limits of agreement was 64.66 around the difference between two total PGI scores. The intraclass correlation coefficient decreased considerably if there had been more than six changes to the areas chosen for inclusion on the...Continue Reading

Citations

Feb 3, 2007·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Faith MartinDanny Ruta
Apr 1, 2006·Expert Review of Pharmacoeconomics & Outcomes Research·Kirstie L HaywoodRay Fitzpatrick
Apr 22, 2008·Health and Quality of Life Outcomes·Miles D WithamMarion E T McMurdo
Aug 24, 2011·Qualitative Health Research·Susan S TavernierSusan L Beck
Dec 19, 2016·Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation·Nancy E MayoSusan Scott

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