Table 5—

Recovered microorganisms according to the risk factors identified in multivariate analysis

Age ≥70 yrsp-value#Renal comorbidityp-value#Cardiac comorbidityp-value#Infiltrates other than alveolarp-value*Total population
With aetiology52/100 (52)4/14 (29)12/34 (35)30/60 (50)122/204 (60)
Streptococcus pneumoniae 17/52 (33)0.8403/4 (75)0.1002/12 (17)0.5095/30 (17)0.11438/122 (31)
Haemophilus influenzae 5/52 (10)0.9660/4 (-)1.00/12 (-)0.5974/30 (13)0.52212/122 (10)
Moraxella catarrhalis 1/52 (2)1.00/4 (-)1.02/12 (17)0.0460/30 (-)1.02/122 (2)
Gram-positive cocci+3/52 (6)1.00/4 (-)1.01/12 (8)0.5812/30 (7)1.08/122 (7)
Gram-negative rods§5/52 (10)0.7180/4 (-)1.00/12 (-)0.3673/30 (10)1.014/122 (12)
Atypicalƒ10/51 (20)0.6281/4 (25)1.06/12 (50)0.0498/30 (27)0.66828/122 (23)
Legionella pneumophila 4/52 (8)1.00/4 (-)1.01/12 (8)1.04/30 (13)0.47911/122 (9)
Others**4/52 (8)1.00/4 (-)1.00/12 (-)1.04/30 (13)0.2879/122 (7)
  • Data are presented as n/total n (%)

  • #: p-value compared to the larger population

  • : Fisher's exact test

  • +: Staphylococcus aureus, Streptococcus viridans, and Streptococcus pyogenes

  • §: Pseudomonas spp., Klebsiella pneumoniae, and Escherichia coli

  • ƒ: Chlamydia spp., Coxiella spp., and Mycoplasma pneumoniae

  • **: Mycobacterium tuberculosis, Aspergillus fumigatus, Eikenella corrodens, and viruses