Clinical presentation and laboratory data on admission
| Symptoms, n (%)* | |
| Previous ‘common cold’ symptoms | 49 (38) |
| Fever | 106 (79) |
| Chills | 46 (36) |
| Cough | 107 (80) |
| Purulent phlegm | 66 (50) |
| Pleuritic pain | 33 (25) |
| Dyspnoea | 102 (76) |
| Nausea/vomiting | 12 (12) |
| Altered mental status | 67 (50) |
| Acute renal failure | 22 (17) |
| Shock | 14 (10) |
| Radiographic features | |
| Cavitation | 1 (1) |
| Atelectasis | 8 (6) |
| Pleural effusion | 27 (20) |
| Alveolar infiltrate pattern | 119 (77) |
| Interstitial infiltrate pattern | 1 (1) |
| Mixed infiltrate pattern | 3 (2) |
| Number of affected lobes, 1 | 83 (61) |
| Number of affected lobes, ≥2 | 51 (38) |
| Vital signs, mean±SD | |
| Respiratory rate | 29±7 |
| Heart rate | 96±19 |
| Systolic blood pressure, mm Hg | 129±28 |
| Diastolic blood pressure, mm Hg | 69±14 |
| Analytical data | |
| Leucocytes >12×109/l, n (%) | 76 (56) |
| Creatinine, mg/dl | 1.5±2.0 |
| C-reactive protein, mg/dl | 20±13 |
| Platelets, ×103/l | 277±111 |
| Na, mEq/l | 138±7 |
| K, mEq/l | 4.2±0.7 |
| Haematocrit, % | 38±6 |
| Serum proteins, g/l | 60±6 |
| Albumin, g/l | 33±7 |
↵* Percentages of all cases with available information.