We evaluated test validity and reliability of the Pediatric Confusion Assessment Method for the ICU (pCAM-ICU), the Pediatric Anesthesia Emergence Delirium (PAED) scale, and our newly created pCAM-ICU severity scale (sspCAM-ICU) for the detection of delirium in PICU patients. We used daily repeated assessments in the same patient to mimic the use of scores in clinical routine.