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Table 2 Risk factors for 30-day mortality

From: Six underlying health conditions strongly influence mortality based on pneumonia severity in an ageing population of Japan: a prospective cohort study

  30-day mortality
  univariate analysis multivariate analysisb
  OR 95% CI AOR 95% CI
Underlying health conditions     
Age group (years old)
  ≤ 64 (1.00)   (1.00)  
 65–74 2.46 1.27–4.74 1.61 0.80–3.26
 75–84 2.49 1.37–4.53 1.37 0.70–2.69
  ≥ 85 3.98 2.21–7.16 2.15 1.08–4.28
HCAP criteria
 Hospitalization ≥2 days within 90 days 2.96 2.03–4.31 2.21 1.36–3.60
 Nursing home resident 2.16 1.44–3.24 1.53 0.92–2.56
 Chronic dialysis within 30 days 2.48 0.92–6.66   
 Home care a 7.00 2.69–18.23 5.84 2.28–14.99
 Male gender 1.84 1.26–2.69 1.78 1.16–2.75
Comorbid illnesses
 Congestive heart failure 1.53 0.97–2.40   
 Liver disease 1.75 0.93–3.29 1.77 0.87–3.61
 Renal disease 1.54 0.92–2.61   
 Neoplastic disease 2.18 1.49–3.18 1.82 1.17–2.85
 Chronic lung disease 1.28 0.86–1.90   
 Diabetes mellitus 1.22 0.80–1.86   
 Dementia 1.69 1.09–2.63   
Risk factors for aspiration
 Witnessed aspiration 1.72 1.16–2.55   
 Chronic impaired conscious level 2.71 1.28–4.98 1.75 0.81–3.76
 Chronic neurologic disorders 0.80 0.37–1.76   
 Foreign bodies interfering with swallowing 1.28 0.29–5.56 0.43 0.10–1.87
 Bed-ridden state 2.49 1.53–4.06   
Body mass index
  < 18.5 2.63 1.72–4.04 1.99 1.25–3.16
 18.5–24.9 (1.00)   (1.00)  
  ≥ 25 0.79 0.36–1.70 1.10 0.77–3.99
CURB score
 0 (1.00)   (1.00)  
 1 2.38 1.30–4.33 1.87 1.01–3.46
 2 5.04 2.74–9.25 3.65 1.95–6.82
 3 7.45 3.71–14.99 4.90 2.22–10.81
 4 35.78 9.88–129.59 29.14 6.07–139.74
  1. OR odds ratio, CI confidence interval, AOR adjusted odds ratio, HCAP healthcare-associated pneumonia, CURB Confusion, blood Urea nitrogen > 7 mmol/L, Respiratory rate > 30 per minute, and Blood pressure < 90 mmHg in systole or ≤ 60 mmHg in diastole
  2. aHome care: home infusion therapy or wound care
  3. bVariables after the variables with p > 0.2 had been removed by the backward stepwise method