Errors in Reported Laboratory Values

In the Original Investigation “Balloon Angioplasty vs Medical Management for Intracranial Artery Stenosis: The BASIS Randomized Clinical Trial,” published Online First September 5, 2024, and in the October 1, 2024, print/online issue of JAMA, there were errors in Tables S2, S3, and S12 in the Supplement. The author has explained these errors and corrections needed in a Letter to the Editor and has confirmed that there are no other errors in the article.