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Table 3 Characteristics of patients with community-acquired pneumonia according to etiologic categories (N° = 390)

From: Etiology of community-acquired pneumonia in a population-based study: Link between etiology and patients characteristics, process-of-care, clinical evolution and outcomes

Characteristics Conventional Bacteria (N = 163 ) Atypical Agent (N = 151) Virus (N = 41) Mixed Infection (N = 35) Pvalue
Age, years, mean (SD) 68.9 (18.3) 47.5 (18.3) 66.1 (17.5) 61.9 (22.9) <0.0001
Female 72 (44.2) 51 (36.8) 19 (46.3) 9 (25.7) 0.07
Immunized against influenza 83 (53.6) 32 (22.2) 32 (82.1) 19 (54.3) <0.0001
Immunized against pneumococcal infection 10 (6.8) 4 (2.8) 2 (5.1) 1 (2.9) 0.4
Number of comorbid conditions      0.002
0 96 (60) 120 (81.6) 24 (60) 21 (60)  
1 44 (27.5) 20 (13.6) 13 (32.5) 11 (31.4)  
>1 20 (12.5) 7 (4.8) 3 (7.5) 3 (8.6)  
Underlying diseases      
Neoplastic disease 10 (6.1) 4 (2.7) 0 (0) 3 (8.6) 0.2
Liver disease 1 (0.6) 2 (1.3) 0 (0) 3 (8.6) 0.005
Congestive heart failure 8 (4.9) 4 (2.7) 0 (0) 0 (0) 0.2
Cerebrovascular disease 11 (6.8) 2 (1.3) 1 (2.4) 2 (5.7) 0.09
Renal disease 7 (4.3) 4 (2.7) 1 (2.4) 2 (5.7) 0.7
Chronic obstructive pulmonary disease 34 (21.1) 9 (6.1) 11 (27.5) 4 (11.4) 0.0003
Diabetes mellitus 18 (11.3) 13 (8.8) 6 (14.6) 3 (8.6) 0.7
Severity of illness at diagnostic      
CURB-65 score*      <0.0001
0-1 79 (48.5) 131 (86.8) 29 (70.7) 20 (57.1)  
2 47 (28.8) 13 (8.6) 9 (22) 10 (28.6)  
>2 37 (22.7) 7 (4.6) 3 (7.3) 5 (14.3)  
Bilateral or multilobe radiographic involvement 38 (23.5) 7 (4.7) 0 (0) 2 (5.7) <0.0001
  1. SD = standard deviation.
  2. Data are presented as numbers (percentage) of patients unless otherwise stated. Percentages exclude patients with missing data.
  3. * Severity of illness on admission assessed with CURB-65 score (Confusion, Urea nitrogen, Respiratory rate, Blood pressure, age ≥65 year).
  4. The p-value obtained from the Chi-square or Fisher exact test for categorical variables, and Kruskal-Wallis test for continuous variables.