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Self-reported information on the diagnosis of colorectal cancer was reliable but not necessarily valid

Lynch, Brigid M., Youlden, Danny R., Fritschi, Lin, Newman, Beth M., Pakenham, Kenneth I., Leggett, Barbara, Owen, Neville, & Aitken, Joanne F. (2008) Self-reported information on the diagnosis of colorectal cancer was reliable but not necessarily valid. Journal of Clinical Epidemiology, 61(5), pp. 498-504.

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Abstract

Objective: Self-report is commonly used in epidemiologic studies; however, few data exist on the reliability and validity of this method for eliciting information related to the diagnosis of colorectal cancer. We examined the testeretest reliability and validity of colorectal cancer patients reporting on the process of their diagnosis. Study Design and Setting: One hundred and sixteen participants completed two telephone interviews, 1 month apart, and 95 general practitioners (GPs) completed a written questionnaire, to elicit information relating to key elements of the process of diagnosis of colorectal cancer.------ Results: Acute symptoms such as rectal bleeding had higher reliability and validity than more general symptoms. Colonoscopy was the most accurately recalled diagnostic test. Recall of diagnosis date, and date of colonoscopy, had high testeretest reliability. There were considerable differences between dates of diagnostic tests given by participants and GPs, but there was no evidence of a bias in a particular direction. Accuracy of recall did not diminish as time from diagnosis increased.------ Conclusion: This study confirms that self-reported symptoms, tests, and dates in the colorectal cancer diagnostic pathway are generally reliable; however, the validity of reported symptoms and tests can be moderate to poor. 2008 Elsevier Inc. All rights reserved.

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ID Code: 18562
Item Type: Journal Article
Additional URLs:
Keywords: Test-retest reliability, Validity, Epidemiologic methods, Self-report, Colorectal cancer, Colonoscopy
DOI: 10.1016/j.jclinepi.2007.05.018
ISSN: 0895-4356
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700) > Public Health and Health Services not elsewhere classified (111799)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > ONCOLOGY AND CARCINOGENESIS (111200)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700) > Epidemiology (111706)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Public Health & Social Work
Copyright Owner: Copyright 2008 Elsevier
Deposited On: 05 May 2009 10:47
Last Modified: 29 Feb 2012 23:49

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