unavailable to recruiters in the early 1990s. These resources identified 229 pregnancies (233 children), living on the geographical periphery of the study area, that were incorrectly assumed to be eligible in 1990–92. As these individuals enrolled and contributed data, we have continued to include them in both the ‘eligible sample’ and the ‘enrolled sample’; as such they are eligible for continuing follow-up and are included in all figures provided in this article.
