Patients applied moisturizers twice daily for 7 or more days before randomization and throughout the study. A 35-day screening period preceded initiation of the study drug. Systemic nonsteroidal immunosuppressants, systemic or topical corticosteroids, topical calcineurin inhibitors, and topical crisaborole could be used only as rescue treatment by patients with intolerable AD symptoms at the discretion of the investigator (additional details in eMethods in Supplement 2). Patients who completed the 16-week treatment period were eligible to participate in an open-label extension study (R668-AD-1434, LIBERTY AD PED-OLE, NCT02612454); patients not enrolling in the open-label extension study were followed up for 12 additional weeks.