Errors in Effect Size Reporting in Abstract, Main Results, Tables 3 and 4, and Supplement 2 July 21, 2026 Jama Network Open Share Summary Takeaways Insight Report Clinical Scorecard Quiz Poll 1 Discrepancies in effect sizes were found in multiple sections of a clinical trial article on cognitive behavioral therapy for insomnia. 2 The inaccuracies were attributed to the automation system used for calculating effect sizes. 3 Effect sizes in the Abstract, main Results, Table 3, Table 4, and Supplement 2 have been recalibrated and revised. 4 The authors provided further clarification regarding the discrepancies in a Comment. 5 The article has been officially amended to reflect the corrected effect sizes.