In the Original Investigation titled “Efficacy of Short-term Treatment of Internet and Computer Game Addiction: A Randomized Clinical Trial,”1 published online July 10, 2019, there were numeric errors in Table 2. The End Point value for wait-list control (WLC) given as “1.5 (4.33)” should have been “10.5 (4.33).” The Global Assessment of Functioning (GAF) values for Short-term Treatment for Internet and Computer Game Addiction given as “69.3 (1.00)” and “76.4 (1.40)” should have been “69.3 (10.0) and “76.4 (10.4),” respectively. The GAF value for WLC given as “7.6 (9.25)” should have been “70.6 (9.25).” This article was corrected online.