Table 4 Cox Proportional Hazards Models for the Effect of Study Variables on Mortality

Older age

1.02 (1.00-1.04)

1.04 (1.01–1.08)

1.02 (1.00-1.05)

Male gender

1.90 (1.37–2.63)

1.91 (1.11–3.29)

1.39 (0.91–2.13)

Type of dementia

• Alzheimer’s disease

Ref

Ref

Ref

• Vascular dementia

1.05 (0.71–1.55)

1.11 (0.59–2.09)

1.12 (0.67–1.84)

• Mixed type

2.95 (1.25–6.99)

3.64 (1.08–12.27)

3.45 (1.17–10.14)

• Other

1.33 (0.81–2.19)

1.44 (0.64–3.24)

1.52 (0.81–2.84)

• Unspecified dementia

1.11 (0.66–1.87)

0.78 (0.29–2.11)

0.88 (0.39–1.98)

Higher TMSE score

0.96 (0.94–0.98)

0.94 (0.91–0.98)

Presence of BPSD

1.26 (0.91–1.74)

0.82 (0.48–1.41)

Higher Charlson Comorbidity Index score

1.14 (1.03–1.26)

1.20 (1.02–1.41)

1.19 (1.04–1.36)

Presence of pressure ulcer

2.92 (1.75–4.85)

2.02 (0.69–5.92)

5.41 (2.71–10.76)

Higher serum albumin

0.55 (0.41–0.74)

0.84 (0.50–1.38)

Higher serum creatinine

1.32 (1.14–1.54)

1.26 (0.99–1.59)

1.35 (1.10–1.66)

Pneumonia

1.86 (1.15–3.02)

1.14 (0.48–2.68)

Urinary tract infection

1.29 (0.88–1.89)

0.94 (0.50–1.75)

Insertion of endotracheal tube

1.85 (1.19–2.87)

1.73 (0.68–4.44)

1.95 (1.07–3.54)

Insertion of nasogastric tube

1.81 (1.30–2.53)

1.60 (0.85–3.04)

Transfusion of blood and blood components

1.93 (1.27–2.92)

1.51 (0.67-3,39)

Readmission within 30 days

1.39 (0.95–2.05)

1.67 (0.90–3.09)

1.88 (1.18–2.98)