2. Outcome definitions for acute confusional state.

Study	Study authors' definition
Cuvillon 2007	Clinical evaluation "somnolence‐confusion"
Godoy 2010	"episodes of delirium"
Graham 2008	"acute confusional state"
Kullenberg 2004	"transient confusion"
Mouzopoulos 2009	"The primary outcome was perioperative delirium. Diagnosis of the syndrome was 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"
Nie 2015	"Presurgery cognitive status was estimated using the mini‐mental state examination before and after surgery. The Confusion Assessment Method was used to diagnose delirium pre‐ and postsurgery"
White 1980	"confused"