Sir.—Your publication of the article by Naeye and Peters1 in the October 1989 issue of AJDC is puzzling. Although presumably written to add clarity to the debate on the role of birth asphyxia as a cause of cerebral palsy (CP), this article offers us a fair measure of further confusion.
The article by Naeye and Peters presents analysis of a data set that has already undergone very sophisticated analysis by Nelson and Ellenberg2,3 and Freeman and Nelson.4 Assuming that Drs Naeye and Peters feel the Nelson and Ellenberg analyses to be deficient on some accounts (why else bother to reanalyze the same data?), they fail to enlighten the reader with specific criticisms of their analyses, with information on how their classification of cases and exposure factors and their results differ from those of Nelson and Ellenberg.2,3
Further, Naeye and Peters do not adequately distinguish between