The article “Sudden Death in Young Athletes: Screening for the Needle in a Haystack” (June 1998, page 2,763) contained an incorrect percentage. The last two sentences of the second paragraph of the section “Screening Strategies and Dilemmas” (page 2,766) should read as follows: “If we had a tool to screen for sudden death with a sensitivity and specificity of 99 percent, the low prevalence of disease would yield a positive predictive value of only 0.05 percent. In other words, only one positive test out of every 2,000 would be correctly positive, and 1,999 would be falsely positive.”