Errors in Data. In the Original Investigation by Russell et al titled “Effects of Prehypertension on Admissions and Deaths: A Simulation,” published in the October 25, 2004, issue of the ARCHIVES (2004;164:2119-2124), an inadvertent error occurred in how the exercise and alcohol consumption variables were handled in the simulation model used to calculate the impact of prehypertension and residual hypertension. This resulted in data errors in Table 2 and Table 3 on page 2122 and subsequent errors wherever these data were cited in the abstract and the text. In addition, the column headings in Table 3 should have read “Change,” as these were absolute changes, not percentage changes. Even though the main finding of the study was essentially unchanged, correcting the data errors completely would have required publication of an extensive correction, including republication of correct data points in the abstract and throughout the text, along with republication of the corrected tables. To present the findings as clearly as possible, the entire corrected article now appears on the ARCHIVES Web site in the October 25 issue (available at http://archinte.ama-assn.org/cgi/content/full/164/19/2119), replacing the incorrect version.