In the Original Investigation titled “Effectiveness of Lumbar Cerebrospinal Fluid Drain Among Patients With Aneurysmal Subarachnoid Hemorrhage: A Randomized Clinical Trial,” published online June 18, 2023, there was an error in the lumbar drain group in Figure 2. The value was updated from 24 to 9 for the group with a modified Rankin Scale score of 5 at 6 months. This article was corrected online.