Table 3.

Predictors of Any, Prevalent, and Incident Delirium

Age (65–74)	Reference	Reference	Reference
Age (75–84)	1.32 [1.22, 1.42]	1.44 [1.31, 1.58]	1.22 [1.09, 1.35]
Age (85–94)	2.22 [2.00, 2.45]	2.66 [2.37, 2.98]	1.42 [1.23, 1.63]
Age (95+)	4.59 [3.71, 5.66]	5.10 [4.08, 6.37]	2.39 [1.78, 3.22]
Race, White	Reference	Reference	Reference
Race, Black or African American	1.29 [1.19, 1.39]	1.48 [1.36, 1.62]	0.98 [0.89, 1.09]
Race, other	1.21 [1.01, 1.45]	1.36 [1.10, 1.67]	0.90 [0.69, 1.16]
Gender, female	0.95 [0.89, 1.02]	1.08 [1.00, 1.17]	0.89 [0.81, 0.97]
Elixhauser score	37.47 [31.85, 44.09]	6.82 [5.74, 8.10]	29.81 [23.98, 37.04]
Dementia	15.10 [13.62, 16.73]	15.32 [13.73, 17.09]	4.11 [3.58, 4.70]
ACSC (Purdy)	0.60 [0.54, 0.67]	0.74 [0.65, 0.84]	0.59 [0.51, 0.69]
Observations	64 020	60 823	49 317
Subjects	39 933	38 200	32 151
Conditional R2	0.56	0.51	0.42
Marginal R2	0.24	0.19	0.15
AIC	45 310.52	29 948.11	20 214.02

Notes: ACSC = ambulatory care-sensitive condition; AIC = Akaike’s information criterion; SIS = six item screener.

Any delirium was defined as delirium occurring at any time during hospitalization. Prevalent delirium was defined as delirium occurring within 1 day of admission, and incident delirium was defined as absence of delirium in the first day but presence of delirium at least once after the first day. Generalized linear mixed models were used to examine the association of ACSCs with each type of delirium, adjusting for covariates and for correlations among multiple hospitalizations for each participant.