Fig. 2. Individual prevalence of delirium on postoperative days (POD) 1, 2, and 3, and overall incidence of delirium in the 3 days postoperatively in the open gastrectomy (OG) and laparoscopic gastrectomy (LG) groups. There was no significant difference between the groups in the individual prevalence of delirium on POD 1, 2 or 3 (P = 0.697, P = 0.055, and P = 0.094, respectively). There was no significant difference between the groups in the overall incidence of delirium during the 3 days postoperatively (P = 0.359).