The goal of this observational study is to learn about the disability profile during transition from ICU to hospital wards of delirium patients, including cognitive impairment, physical dysfunction and psychological disorders. The main question it aims to answer is: * What is the main rehabilitation problem during transition from ICU to hospital wards for patients who experienced ICU delirium? * Dose different phenotypes of ICU delirium shows different rehabilitation problem during ICU transition? Participants will be followed up and assessed by questionnaires after discharge from ICU to hospital wards until hospital discharge.