Fig. 2
From: Risk factors of postoperative delirium after cardiac surgery: a meta-analysis
The forest plots summarizing preoperative risk factors. a Age increase per year. b Age > 65 years. c Carotid artery stenosis. d Diabetes. e Hypertension. f Left ventricular ejection fraction by percentage. g Preoperative depression. h NYHA functional class III or IV. i Preoperative mild cognitive impairment. j Preoperative use of statins. Results were summarized with OR and corresponding 95% CI. I2 statistic was used to assess heterogeneity among studies