Author, year of
publication		 RoB
ratinga		 Sample size (female %) No. of patients with ascertained delirium (prevalence rate %)b No. of Patients with delirium in DS (%)c No. of patients with delirium in HAS (%)d Delirium ascertainment method Hospital coding format
Alhaidari 2017 M 100 (46.0) 49/100 (49.0) 19/49 (38.8) 19/39 (48.7)e Documented features sufficient to fulfil short CAM ICD-10
Bui 2017 M 1055 (51.0) 423/1055 (40.1) N/A 22/423 (5.2) CAM-ICU ICD-9-CM
Campbell 2014 L 424 (N/A) 163/424 (38.4) N/A 52/163 (31.9) CAM ICD-9
Casey 2019 H 559 (54.6) 91/559 (16.3) N/A Overall: 58/559 (10.3)
Study-ascertained delirium: 31/91 (34.1)		 4AT
3D-CAM		 ICD-10
Chuen 2021 H 110 (44.5) 110/110 (100.0) 70/110 (63.6) N/A CHART-DEL N/A
Detweiler 2014 H 183 (3.3) 52/183 (28.4) 5/52 (9.6) N/A DSM-IV TR N/A
Glick 1996 H Overall: 195 (N/A)
Sub-study: 67 (N/A)f		 67/195 (34.4) Overall: 12/195 (6.2)
Sub-study: 8/67 (11.9)f		 N/A DSM-III N/A
Heriot 2017 M 348 (41.9) 104/348 (29.9) N/A 36/104 (34.6) DSM-IV
Chart review		 ICD-10
Hope 2014 H 25g (4.0) 25/25g (100.0) 11/25 (44.0) 7/25 (28.0) DMHC notes
Chart review		 ICD-9
Inouye 2005 H 919 (60.0) 115/919 (12.5) N/A 3/115 (2.6) CAM
MMSE		 ICD-9CM
Johnson 1992 H 235 (N/A) 48/235 (20.4) N/A 2/47h (4.3) MMSE
BPRS
DSM-III
Clinical/Psychiatric examination		 ICD-9CM
Katznelson 2010 M 1528 (29.0) 182/1528 (11.8) N/A 46/182 (25.3) CAM-ICU ICD-10
Pendlebury 2020 M 1281 (52.0) 320/1281 (25.0) N/A 111/320 (34.7)i DSM-IV ICD-10j
Ruangratsamee 2016 M 225 (59.1) 110/225 (48.9) 16/110 (14.5) N/A DSM-IV N/A
Sanchez 2013 H 5325 (N/A) 410/5325 (7.7) N/A N/A (29.5) DSM-IV ICD-10
Smulter 2019 M 142 (30.8) 78/142 (54.9) 41/78 (52.6) 16/78 (20.5) OBS Scale
MMSE
DSM-IV-TR		 ICD-10
van Zyl 2003 H 31 (64.5) 31/31 (100.0) 5/31 (16.1) N/A DSM-IV
DRS
DRS-R-98		 N/A
Welch 2018 M 1327 (62.0) 125/1327 (9.4) 61/125 (49.0) N/A DSM-IV N/A
Welch 2019 H 1507 (54.2) 222/1507 (14.7) 44/154 (28.6)j N/A 4AT
DSM-V		 N/A
Zalon 2017 H 34 (82.4) 34/34 (100.0) 1/34 (2.9) 13/34 (38.2) CAM ICD-9
Studies which did not use additional delirium ascertainment methods
Bellelli 2015 L 2521 (50.8) N/A N/A 72/2521 (2.9) N/A ICD-9
Kales 2003 H 267947 (2.0) N/A N/A 3978/267947 (1.5)m N/A ICD-9CM
Kelly 2012 H Overall: 64046 (44.0)
Sub-study: 53 (N/A)l		 N/A Overall: 89/64046 (0.1)k
Sub-study: 8/53 (15.1)l		 N/A N/A ‘Delirium’ or ‘encephalopathy’ in ‘discharge problem list’
McCoy 2017 H 809512 (54.8) N/A 7579/809512 (0.9)k 27513/809512 (3.4)m N/A ICD-9