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Diagnostic interval and mortality in colorectal cancer: U-shaped association demonstrated for three different datasets.

Abstract：

OBJECTIVE:To test the theory of a U-shaped association between time from the first presentation of symptoms in primary care to the diagnosis (the diagnostic interval) and mortality after diagnosis of colorectal cancer (CRC). STUDY DESIGN AND SETTING:Three population-based studies in Denmark and the United Kingdom using data from general practitioner's questionnaires, interviewer-administered patient questionnaires, and primary care records, respectively. RESULTS:Despite variations in the potential selection and information bias when using different methods of identifying the date of first presentation, the association between the length of the diagnostic interval and 5-year mortality rate after the diagnosis of CRC was the same for all three types of data: displaying a U-shaped association with decreasing and subsequently increasing mortality with longer diagnostic intervals. CONCLUSION:Unknown confounding and in particular confounding by indication is likely to explain the counterintuitive findings of higher mortality among patients with very short diagnostic intervals, but cannot explain the increasing mortality with longer diagnostic intervals. The results support the theory that longer diagnostic intervals cause higher mortality in patients with CRC.

journal_name

J Clin Epidemiol

journal_title

Journal of clinical epidemiology

authors

Tørring ML,Frydenberg M,Hamilton W,Hansen RP,Lautrup MD,Vedsted P

doi

10.1016/j.jclinepi.2011.12.006

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

669-78

issue

6

eissn

0895-4356

issn

1878-5921

pii

S0895-4356(11)00388-X

journal_volume

65

pub_type

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