Table 2.

Results of mixed effects logistic regression models for delirium in the screening cohort and for subset of patients screened for ICU-acquired delirium.

	All Patients Screened for Delirium (n = 2742)		Subset Screened for ICU-acquired Delirium (n = 2117)
Characteristics	OR (95% CI)	P-value	OR (95% CI)	P-value
Age
18–49	0.27 (0.17, 0.44)	<0.001	0.25 (0.12, 0.54)	0.001
50–64	0.6 (0.41, 0.88)	0.009	0.55 (0.31, 0.98)	0.041
65+ (Reference)	1.0		1.0
Race
African-American	1.24 (0.92, 1.67)	0.161	1.01 (0.64, 1.60)	0.962
Caucasian (Reference)	1.0		1.0
Insurance
Medicaid	1.34 (0.84, 2.13)	0.215	1.84 (0.87, 3.90)	0.111
Self-pay (Reference)	1.0		1.0
Clinical Characteristics
Mechanical Ventilation	6.74 (4.21, 10.77)	<0.001	4.46 (2.19, 9.07)	<0.001
Acute Respiratory Failure	1.34 (0.92, 1.95)	0.121	0.95 (0.53, 1.71)	0.873
Acute Renal Failure	1.64 (1.21, 2.22)	0.002	1.84 (1.15, 2.96)	0.012
Trauma	1.38 (0.94, 2.03)	0.104	0.87 (0.47, 1.60)	0.645
Hypoalbuminemia	1.89 (1.40, 2.54)	<0.001	2.42 (1.53, 3.84)	<0.001
Dementia	1.62 (1.05, 2.49)	0.029	1.64 (0.87, 3.11)	0.128
Smoking	0.84 (0.61, 1.14)	0.253	0.90 (0.56, 1.45)	0.663
Alcohol Abuse History	1.55 (1.05, 2.28)	0.028	1.35 (0.71, 2.57)	0.363
MICU vs. SICU	1.11 (0.78, 1.59)	0.553	0.69 (0.41, 1.16)	0.155
Benzodiazepines	1.60 (1.15, 2.22)	0.005	1.66 (1.03, 2.69)	0.038
Opioids	1.03 (0.74, 1.44)	0.856	1.45 (0.83, 2.56)	0.194
Mean RASS Score	0.43 (0.38, 0.49)	<0.001	0.38 (0.30, 0.47)	<0.001
ICU Admission Time*
Number of years from 2010*	0.82 (0.73, 0.92)	0.001	0.80 (0.66, 0.97)	0.021

^*Time in years as a continuous variable for the number of years that ICU admission from the first study year of 2010.

n: Unique patient admissions. MICU: Medical ICU; RASS: Richmond Agitation Sedation Scale; SICU: Surgical ICU.