Effects of Tai Chi and cognitive behavioral therapy for insomnia on improving sleep in older adults: Study protocol for a non-inferiority trial.

"Declaration of competing interest The authors declare that they have no competing interests."

"Funding This study is supported by General Research Fund of Research Grants Council (RGC), Hong Kong University Grants Committee (project number: 17112819) and Seed Fund for Basic Research of the 10.13039/501100003803University of Hong Kong. The funder had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication."

"This interventional study will be a single-center, parallel, assessor-blinded, non-inferiority randomized controlled trial. Participants will be allocated to the Tai Chi group or CBT-I group in a 1:1 ratio. The intervention will last for 3 months, and the follow-up period will last for 12 months. The total duration of the study will be 15 months. Assessments will be conducted at baseline, 3 months (post-intervention), and 15 months (12-month follow-up). The study was approved by the University of Hong Kong/Hospital Authority Hong Kong West Institutional Review Board (IRB approval number: UW 18–621). The study was registered in ClinicalTrials.gov (register number: NCT04384822, dated May 12, 2020). An independent committee was formed to review data and safety of study during the IRB application. Details were recorded in the IRB application form. The study will be conducted in accordance with the appropriate data protection legislation and the Declaration of Helsinki."