In the Original Investigation titled “Longitudinal Cognitive Changes in Young Individuals at Ultrahigh Risk for Psychosis,”1 published online July 25, 2018, there was an error in the Demographics paragraph of the Results section. A parenthetical phrase describing demographics indicated “17 nonconverters” and “156 converters.” The numbers should have been reversed to “17 converters” and “156 nonconverters.” This article was corrected online.