Study ID	Diagnostic criteria
Brownbridge 2018	CAM‐ICU scoring system will be used daily to measure delirium (time frame: during hospital stay up to 1 month)
Cuvillon 2007	Clinical evaluation "somnolence‐confusion" and Mini Mental Test
Godoy Monzon 2010	"episodes of delirium"
Graham 2008	"acute confusional state"
Kullenberg 2004	Pfeiffer test, graded according to a 4‐degree scale (0 to 3: no, light, moderate, and pronounced confusion)
Liebmann 2012	"agitation or confusion"
Morrison 2008	Confusion Assessment Method daily supplemented by chart review
Mouzopoulos 2009	Perioperative delirium: syndrome defined using the Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM‐IV), and Confusion Assessment Method (CAM) criteria "Daily patient assessments using the MMSE, DRS‐R‐ 98, and Digit Span test [assessment of attention, range 0 (no attention) to 42 (good attention)] were used to enable the DSM‐IV and CAM diagnoses and assess delirium severity"; "CAM and DRS‐R‐98 assessments were continued once delirium was diagnosed"
Nie 2015	"The Confusion Assessment Method was used to diagnose delirium pre‐ and postsurgery"
Uysal 2018	"Delirium Rating Scale‐R‐98 (DRS‐R‐98)"
White 1980	"confusion"
Yamamoto 2016	"Delirium occurring within 24 hour after surgery was diagnosed by the Confusion Assessment Method"
Yang 2016	"delirium"