The authors reply

Abstract

e1269delirium was associated with better long-term functions compared with hyperactive (p = 0.04) or mixed delirium (p = 0.01), which contradicts the conclusion of the study by Rengel et al (1). Therefore, it is worrying that assigning patients with mixed delirium to a hypoactive and hyperactive group may lead to an inaccurate analysis or even false-negative result in the study by Rengel et al (1).