Table 1.

Baseline characteristics

	No delirium (n = 24)	Delirium (n = 53)	P-value
Age, median (IQR)	84 (70–89)	86 (81–90)	0.21
Gender, male (%)	7 (29)	16 (30)	0.93
APACHE II, median (IQR)a	8 (6–10)	9 (8–11)	0.10
IQCODE, median (IQR)	3.1 (3.0–3.6)	4.3 (3.3–4.8)	<0.001
Dementia (%)	3 (13)	35 (66)	<0.001
ADL, median (IQR)	19.5 (18–20)	16 (12–19)	<0.001
CCI, median (IQR)	1 (0–2)	1 (0–2)	0.96

^aArterial blood gas and hematocrit omitted from formula

IQR interquartile range, APACHE II Acute Physiology and Chronic Health Evaluation II, IQCODE Informant Questionnaire on Cognitive Decline in the Elderly, ADL activities of daily living, CCI Charlson Comorbidity Index score