Incorrect statistical associations. The article, “Evaluation of Nausea and Vomiting in Adults: A Case-Based Approach” (September 15, 2013, p. 371) incorrectly reported negative predictive values in the “Statistical associations” columns in Tables 2 (p. 373) and 4 (p. 376). In both tables, most of the negative predictive values reported were actually posttest probabilities. Also, in Table 4, the “Appendicitis” row incorrectly listed the sensitivity and specificity for abdominal ultrasonography, and the positive likelihood ratios, negative likelihood ratios, and positive predictive values for abdominal ultrasonography and multidetector abdominal and pelvic computed tomography. Most of these errors had been made in some of the source references as well. The online version of the article has been corrected to provide the correct values in both tables.