Mortality from community-acquired pneumonia according to aetiology and PSI risk class: number of deaths among patients with specific aetiology (% of all deaths with specific aetiology) per PSI risk class
| Aetiology | PSI I–III (n=22/1608, 1.4%) | PSI IV (n=82/1193, 6.9%) | PSI V (n=153/708, 21.6%) | Total (n=257/3509, 7.3%) |
| Streptococcus pneumoniae | 4/276 (1) | 11/205 (5) | 30/132 (23) | 45/613 (7) |
| Haemophilus influenzae | 0/27 (0) | 0/28 (0) | 2/15 (13) | 2/70 (3) |
| Moraxella catarrhalis | 1/2 (50) | 0/2 (0) | 1/1 (100) | 2/5 (40) |
| Atypical bacteria | 1/163 (1) | 2/77 (3) | 1/23 (4) | 4/263 (2) |
| Legionella pneumophila | 0/54 (0) | 1/50 (2) | 1/14 (7) | 2/118 (2) |
| Mycoplasma pneumoniae | 1/51 (2) | 1/12 (8) | 0/2 (0) | 2/65 (3) |
| Chlamydophila pneumoniae | 0/31 (0) | 0/13 (0) | 0/6 (0) | 0/50 (0) |
| Coxiella burnetii | 0/27 (0) | 0/2 (0) | 0/1 (0) | 0/30 (0) |
| Virus | 1/62 (2) | 1/57 (2) | 1/29 (3) | 3/148 (2) |
| Staphylococcus aureus | 1/9 (11) | 2/10 (20) | 3/6 (50) | 6/25 (24) |
| MS | 1/5 (20) | 1/5 (20) | 2/4 (50) | 4/14 (29) |
| MR | 0/4 (0) | 1/5 (20) | 1/2 (50) | 2/11 (18) |
| GNEB | 1/7 (14) | 3/9 (33) | 4/11 (36) | 8/27 (30) |
| Pseudomonas aeruginosa | 0/9 (0) | 2/17 (12) | 6/23 (26) | 8/49 (16) |
| Mixed | 2/84 (2) | 5/73 (7) | 15/51 (29) | 22/208 (11) |
| Others | 1/20 (5) | 4/22 (18) | 2/10 (20) | 7/52 (13) |
| Unknown | 10/949 (1) | 52/693 (7) | 88/407 (22) | 150/2049 (7) |
Data are expressed as number of deaths/n (%).
PSI was not available in 14 patients.
GNEB, Gram-negative enteric bacilli; MR, methicillin-resistant; MS, methicillin-sensitive; PSI, pneumonia sensitivity index.