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Table 1 Baseline characteristics (n = 873)

From: Hyponatremia and anti-diuretic hormone in Legionnaires’ disease

Parameter All CAP patients Legionnaires’ disease Other CAP etiology p
  n = 873 n = 27 n = 846  
Demographics     
Age (years), mean (SD) 68.3 (±0.6) 64.9 (±3.1) 68.4 (±0.6) 0.35
Male gender, n (%) 512 (58.7%) 20 (74.1%) 492 (58.2%) 0.09
Comorbidities, n (%)     
Congestive heart failure 151 (17.3%) 2 (7.4%) 149 (17.6%) 0.16
COPD 266 (30.5%) 3 (11.1%) 263 (31.1%) 0.03
Diabetes 149 (17.1%) 6 (22.2%) 143 (16.9%) 0.47
Tumor 109 (12.5%) 2 (7.4%) 107 (12.7%) 0.42
Chronic renal failure 195 (22.3%) 7 (25.9%) 188 (22.2%) 0.65
Clinical presentation, mean (SD)     
Heart rate (beats/min) 95.7 (±0.7) 101.3 (±3.9) 95.5 (±0.7) 0.12
Blood pressure systolic (mmHg) 133.1 (±0.8) 136.5 (±4.1) 133 (±0.8) 0.45
Respiratory rate (breaths/min) 22.1 (±0.3) 25.7 (±3.4) 22 (±0.3) 0.052
Temperature (°C) 38 (±0.1) 38.7 (±0.2) 38 (±0.1) 0.012
Blood analysis on admission, mean (SD)     
Sodium (mmol/l) 135.3 (±0.2) 131.6 (±0.9) 135.4 (±0.2) <0.001
Sodium < 130 mmol/l, n (%) 81 (9.3%) 12 (44.4%) 69 (8.2%) <0.001
C-reactive protein (mg/l) 178.4 (±4.5) 334.2 (±23.6) 173.4 (±4.4) <0.001
Procalcitonin (µg/l) 4.4 (±0.5) 4.1 (±0.9) 4.4 (±0.5) 0.92
CT-ProVasopressin (pmol/l) 50.9 (±2.6) 39.4 (±7) 51.2 (±2.7) 0.43
Risk scores on admission, mean (SD)     
PSI score 92 (±1.2) 101.4 (±6) 91.7 (±1.2) 0.17
CURB65 score 1.5 (±0) 1.4 (±0.2) 1.5 (±0) 0.61
Hospital outcomes     
Mortality, n (%) 49 (5.6%) 2 (7.4%) 47 (5.6%) 0.68
ICU admission, n (%) 79 (9.1%) 9 (33.3%) 70 (8.3%) <0.001
Length of stay (days), mean (SD) 9.8 (±0.3) 12.3 (±1.8) 9.7 (±0.3) 0.09