Table 4 Univariate logistic regression analysis of risk factors for having a prevalent delirium after acute admission

Age (yrs.)

1.08 (1.02–1.13)

<0.01

Male

1.62 (0.74–3.53)

0.23

Comorbidity

   Mild

1.00

   Moderate

0.74 (0.26–2.16)

0.58

   Severe

0.68 (0.25–1.81)

0.43

Cognitive impairment

10.98 (3.56–33.83)

<0.01

Katz ADL

   0–4

1.00

   5–6

4.22 (0.90–19.92)

0.07

   ≥ 7

11.76 (3.23–42.77)

<0.01

Admission reason

   Infectious disease

0.71 (0.25–2.04)

0.52

   Malignancy

0.25 (0.04–1.41)

0.12

   Gastrointestinal bleeding

0.19 (0.02–1.77)

0.14

   Water and electrolyte disturbances

6.50 (1.05–40.13)

0.04

   Other

1.00

Urea (mmol/L)

1.06 (1.01–1.11)

0.01

Creatinine (μmol/L)

1.00 (1.00–1.00)

0.36

Leucocytes (* 10⁹/L)

0.95 (0.88–1.01)

0.11

CRP

1.00 (1.00–1.01)

0.31

Number of medications

0.96 (0.86–1.08)

0.51

   Benzodiazepines (%)

1.84 (0.60–5.62)

0.29

   Narcotic analgetics (%)

2.31 (0.66–8.1)

0.19

   Corticosteroids (%)

1.48 (0.46–4.78)

0.51

   Antihistaminics (%)

1.28 (0.11–14.58)

0.84

   Cholinergic drugs (%)

1.30 (0.31–5.50)

0.72

   Any of these 5 medications (%)

1.41 (0.61–3.27)

0.42