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Erratum: Negative Controls: A Tool for Detecting Confounding and Bias in Observational Studies

doi: 10.1097/EDE.0b013e3181e4bfd7
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Lipsitch M, Tchetgen Tchetgen E, Cohen T. Negative controls: a tool for detecting confounding and bias in observational studies. Epidemiology. 2010;21:383–388.

The sentence beginning at the bottom of page 386 should read: “If A and B are perfectly U-comparable and B does not cause Y, then a null finding of B-Y means that the A-Y association is unbiased.”

In the published version, the phrase “null finding of B-Y” was written incorrectly as “null finding of A-N.”

© 2010 Lippincott Williams & Wilkins, Inc.