Correction to: Journal of Exposure Science and Environmental Epidemiology (2006) 16: 30–38; advance online publication, July 6, 2005; doi:10.1038/sj.jea.7500434

In terms of equations (5) and (6) as given in the article, the equation at the beginning of the Regression Calibration subsection within Methods (end of page 32) should be

The subject-specific slope of Xt is [β1(θ1+φi)]. However, the fixed-effect (or average) slope of Xt is still β1θ1, which is the quantity of interest as described in the article.

The authors would like to apologise for this mistake.