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Postoperative delirium is the most common complication of surgery particularly in older patients.

The current study aimed to summarize the commonly used delirium assessment tools in assessing postoperative delirium (POD) and to estimate the incidence rates of POD.

A systematic review that included empirical cohort studies reporting the use of delirium assessment tools in assessing POD between 2000 and 2019. Five core databases were searched for eligible studies. The methodological quality assessment of the included studies was undertaken using the Joanna Briggs Institute (JBI) critical appraisal checklist to examine the risk of bias. Pooled incidence estimates were calculated using a random effects model.

Nineteen studies with a total of 3,533 postsurgery older patients were included in this review. The confusion assessment method (CAM) and CAM‐ICU were the …