Table 1

Baseline characteristics of pneumonia patients by hyponatremia status

Hyponatremia present

(n = 649)

Hyponatremia absent

(n = 7,316)


Mean (SD) age (years)*

72.4 (15.7)

68.0 (22.0)

Proportion male (%)

48.2

44.9

Proportion Caucasian (%)

87.8

85.0

Mean (SD) Deyo-CCI*

1.7 (1.7)

1.6 (1.6)

Proportion in teaching hospitals

33.3

29.5

Source of admission (%)

Acute Care Facility

0.2

0.7

ER

77.3

71.8

Physician referral

16.2

17.3

Skilled Nursing Facility

1.4

2.0

Transfer

1.1

1.1

Other

0.5

0.7

Missing/Unknown

3.4

6.4


SD = standard deviation; CCI = Charlson Comorbidity Index; ER = emergency room

*p < 0.05 by Wilcoxon rank-sum test

p < 0.05 by chi-square

Zilberberg et al. BMC Pulmonary Medicine 2008 8:16   doi:10.1186/1471-2466-8-16

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