In the Original Investigation titled “Intra-aortic Balloon Pump Therapy for Acute Myocardial Infarction: A Meta-analysis,” published in the June 2015 issue of JAMA Internal Medicine,1 the positive and negative numbers on the x-axis of Figure 5 were transposed. The numbers should read from 0 to 5 on the left side of the axis and from 0 to −5 on the right side. This article was corrected online.