Table 1: Baseline clinical and demographic characteristics of patients in the short and prolonged delirium group.

CharacteristicShort deliriumProlonged delirium OR (95% CI) value

Age*84.6 ± 4.785.6 ± 5.91.04 (0.93–1.15)0.50
Female°17 (77.3)21 (72.4)1.30 (0.36–4.69)0.69
Mini-Mental State Examination (MMSE) score 23.0 ± 3.119.6 ± 5.50.84 (0.71–0.99)0.02
APACHE II score13.3 ± 3.013.9 ± 3.11.14 (0.87–1.49) 0.34
Snellen test*31.6 ± 18.138.6 ± 35.51.01 (0.98–1.04)0.41
Barthel ADL Index score*△17.4 ± 3.014.0 ± 4.10.76 (0.62–0.93)0.003
Lawton IADL score*14.8 ± 5.818.6 ± 8.31.08 (0.99–1.17)0.08
Geriatric Depression Scale-15 score*†6.4 ± 1.16.4 ± 1.7 0.98 (0.61–1.59)0.95
CRP value*12.7 ± 25.213.4 ± 28.51.00 (0.98–1.02)0.76
History of previous delirium°0 (0)12 (46.2)N.A.0.001
IQCODE-N > 3.6°11 (50) 26 (89.7)8.7 (2.02–37.26)0.002
Number of concomitant diseases at admission*2.4 ± 1.53.2 ± 2.51.20 (0.90–1.60)0.18
Number of medication at admission*4.2 ± 2.45.6 ± 3.81.15 (0.95–1.38)0.12
MMSE score on the first day of delirium 18.1 ± 6.315.1 ± 6.00.92 (0.83–1.03)0.13
¥DRS-R-98 score on the first day of delirium*18.6 ± 6.420.6 ± 6.51.05 (0.96–1.15)0.28

Data are presented as mean ± SD or (%) unless otherwise indicated.
*Continuous variables, °dichotomous variables.
OR: odds ratio, the chance of developing prolonged delirium, CI: confidence interval.
APACHE II: Acute Physiological and Chronic Health Evaluation II.
IQCODE-N: Informant Questionnaire on Cognitive Decline in the Elderly, >3.6 indicates preexistent cognitive decline.
DRS-R-98: Delirium Rating Scale Revised-98.
Range 0 (severe cognitive impairment) to 30 (no cognitive impairment).
§Range 0 (no acute health problems) to 70 (severe acute health problems).
Range 0 (severe disability) to 20 (no disability).
Range 8 (no disability) to 31 (severe disability).
Range 0 (depression not likely) to 15 (depression very likely).
¥Range 0 (no delirium symptoms) to 39 (maximum severity).