Incidence of in-hospital postoperative delirium (POD) and postoperative cognitive dysfunction (POCD) during follow-up. Venn diagrams for overlap of POD and POCD at postoperative months 1 (left), 2 (center), and 6 (right). The three circles in each diagram illustrate the relative proportions of patients who (1) met criteria for POCD (left) at 1, 2, or 6 months after surgery, (2) developed POD while hospitalized (right), and (3) developed in-hospital POD and also met criteria for POCD (center) at each follow-up. Tetrachoric correlations (r_tet) and kappa coefficients are displayed for each month. Proportions estimated from multiply-imputed data.