Corrected Classification of Drugs in Table

In the Original Investigation titled “α2-Adrenergic Agonists or Stimulants for Preschool-Age Children With Attention-Deficit/Hyperactivity Disorder,” published May 4, 2021, in JAMA, the medications listed at the bottom of Table 1 were in the wrong columns. The drug classes listed as α2-agonists and those listed as stimulants were reversed. This article was corrected online.