Table 1 Comparison of patient characteristics and inflammatory and nutritional parameters between the ≥65- and <65-year-old groups

Patients’ characteristics

 Mean age (years)

80.1 ± 7.7

44.5 ± 13.9

<0.001*

 Sex (male/female)

13/23

12/9

0.123

 Body mass index (kg/m²)

18.7 ± 4.1

19.6 ± 2.1

0.284

 CURB-65 score on admission

1.9 ± 0.9

0.5 ± 0.9

<0.001*

 PSI on admission

105.6 ± 24.5

28.2 ± 46.2

<0.001*

Inflammatory parameters

 White blood cell count (/mm³)

12,750 ± 6490

13,300 ± 5460

0.744

 C-reactive protein (mg/dL)

12.57 ± 11.97

9.60 ± 9.56

0.297

Nutritional parameters

 Lymphocyte count (/mm³)

1415.6 ± 1211.5

1664.0 ± 531.0

0.378

 Serum albumin (g/dL)

3.27 ± 0.59

3.76 ± 0.64

0.005*

 Total cholesterol (mg/dL)

167.5 ± 49.7

170.3 ± 43.5

0.833

 Serum cholinesterase (IU/L)

189.8 ± 54.3

237.0 ± 78.1

0.010*