Table 2 

Hospital outcomes of pneumonia patients by hyponatremia status 

Hyponatremia present (n = 649) 
Hyponatremia absent (n = 7,316) 
p value* 



Hospital mortality (%) 
5.4 
4.0 
0.099 
Proportion on MV (%) 
3.9 
2.3 
0.014 
Proportion in ICU (%) 
10.0 
6.3 
<0.001 
Mean (SD) ICU LOS (days) 
6.3 (5.6) 
5.3 (5.1) 
0.069 
Mean (SD) HLOS (days) 
7.6 (5.3) 
7.0 (5.2) 
<0.001 
Median (95%CI) hospital costs 
$7,086 ($3,765–$14,221) 
$5,732 ($2,966–$12,290) 
0.001 


MV = mechanical ventilation; ICU = intensive care unit; SD = standard deviation; HLOS = hospital length of stay; CI = confidence interval *Pvalues obtained using Wilcoxon ranksum test or Median score test for continuous variables, and chisquare test for categorical variables 

Zilberberg et al. BMC Pulmonary Medicine 2008 8:16 doi:10.1186/14712466816 