Skip Navigation
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

National Institute of Environmental Health Sciences

Use this QR code to view the newest version of this document
Use this QR code to view the newest version of this document

Your Environment. Your Health.

Publication Detail

Title: Illustrating bias due to conditioning on a collider.

Authors: Cole, Stephen R; Platt, Robert W; Schisterman, Enrique F; Chu, Haitao; Westreich, Daniel; Richardson, David; Poole, Charles

Published In Int J Epidemiol, (2010 Apr)

Abstract: That conditioning on a common effect of exposure and outcome may cause selection, or collider-stratification, bias is not intuitive. We provide two hypothetical examples to convey concepts underlying bias due to conditioning on a collider. In the first example, fever is a common effect of influenza and consumption of a tainted egg-salad sandwich. In the second example, case-status is a common effect of a genotype and an environmental factor. In both examples, conditioning on the common effect imparts an association between two otherwise independent variables; we call this selection bias.

PubMed ID: 19926667 Exiting the NIEHS site

MeSH Terms: No MeSH terms associated with this publication

Back
to Top