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

Lynch Brigid M., Youlden, Danny, Fritschi, Lin, Newman, Beth, Pakenham, Kenneth I., Leggett, Barbara, Owen, Neville and 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: 498-504. doi:10.1016/j.jclinepi.2007.05.018


Author Lynch Brigid M.
Youlden, Danny
Fritschi, Lin
Newman, Beth
Pakenham, Kenneth I.
Leggett, Barbara
Owen, Neville
Aitken, Joanne F.
Title Self-reported information on the diagnosis of colorectal cancer was reliable but not necessarily valid
Journal name Journal of Clinical Epidemiology   Check publisher's open access policy
ISSN 0895-4356
Publication date 2008-05-01
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.jclinepi.2007.05.018
Open Access Status
Volume 61
Issue 5
Start page 498
End page 504
Total pages 7
Editor Andre J. Knottnerus
P. Tugwell
Place of publication Kidlington, Oxford, UK
Publisher Pergamon Elsevier
Language eng
Subject C1
920102 Cancer and Related Disorders
111706 Epidemiology
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 test-retest reliability and validity of colorectal cancer patients reporting on the process of their diagnosis.
Formatted 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 test–retest 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 test–retest 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.
Keyword Test-retest reliability
Validity
Epidemiologic methods
Self-report
Colorectal cancer
Colonoscopy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes published online 16 October 2007.

 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 17 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 09 Apr 2009, 21:50:20 EST by Cathy Swart on behalf of School of Public Health