Intensive care unit delirium is an independent predictor of longer hospital stay: a prospective analysis of 261 non-ventilated patients

Table 1 Patient demographicsa^a

	Ever Delirium (n = 125)	Never Delirium (n = 135)	p-value
Characteristic
Mean age (± 1 SD; years)	56 (± 18)	49 (± 17)	0.002
Male	62 (50%)	67 (50%)	1.0
No. of Caucasians	99 (79%)	115 (85%)	0.25
APACHE II score, median (IQR)	15 (10–21)	11 (6–16)	<0.001
Charlson co-morbidity index, median (IQR)	4 (2–7)	3 (1–6)	0.079
Diagnostic category for ICU admission (%)b
Pulmonary	29	40
Gastrointestinal	20	21
Metabolic	22	18
Cardiac	7	9
Hematology/oncology	5	4
Neurologic	5	3
Renal	9	2
Other	3	3

^aOne patient of the 261 enrolled had persistent coma and was never able to be evaluated for delirium. This patient was not included in the tables or figures. ^bThe diagnostic categories for ICU admission were recorded by the patients' medical teams as the diagnostic category most representative of the reason for ICU admission. There was no statistically significant difference between the groups in terms of admission categories (p = 0.23). Acute Physiology and Chronic Health Evaluation II (APACHE II) is a severity of illness scoring system, and these data were calculated using the most abnormal parameters during the first 24 hours following admission to the intensive care unit. APACHE II scores range from 0 (best) to 71 (worst). The Charlson co-morbidity index represents the sum of a weighted index that takes into account the number and seriousness of pre-existing comorbidities. ICU, intensive care unit; SD, standard deviation.

ISSN: 1364-8535