Li 2015a.

Trial name or title	Effects of 2 different anesthesia‐analgesia methods on incidence of postoperative delirium in elderly patients undergoing major thoracic and abdominal surgery: study rationale and protocol for a multicenter randomized controlled trial
Methods	RCT
Participants	1800 elderly participants (age range: 60 to 90 years) scheduled to undergo major thoracic or abdominal surgery
Interventions	Intervention: combined epidural‐general anaesthesia plus postoperative epidural analgesia Control: general anaesthesia plus postoperative intravenous analgesia
Outcomes	7‐Day incidence of postoperative delirium Duration of postoperative delirium Pain during the first 3 days after surgery 30‐Day incidence of postoperative non‐delirium complications Length of stay in hospital after surgery 30‐Day all‐cause mortality
Starting date	November 2011
Contact information	Department of Anesthesiology and Critical Care Medicine, Peking University First Hospital, No.8 Xishiku Street, Xicheng District, Beijing, 100034, China
Notes	ClinicalTrials.gov NCT01661907 and Chinese Clinical Trial Registry ChiCTR‐TRC‐12002371

RCT: randomized controlled trial