Empyema n = 10

Empyema + NP n = 25

p-value

Blood at admisssion

Hemoglobin (g/l)

104 [100 to 130]

102 [79 to 123]

0.13

Platelets (G/l)

328 [237 to 629]

266 [143 to 999]

0.08

WBC (G/l)

18.3 [10.0 to 29.9]

13.2 [0.6 to 33.8]

0.22

WBC > 15 G/l

6/9 (66.7%)

10/24 (41.7%)

0.26

CRP (mg/l)

193 [138 to 200]

200 [60 to 200]

0.41

Pleural fluid

WBC (G/l)

66.5 [12.1 to 137.6]

1.1 [0.03 to 72.0]

0.0002

pH

6.8 [6.8 to 7.0]

7.5 [6.4 to 8.0]

0.07

LDH (U/l)

18040 [7128 to 31416]

3138 [586 to 39525]

0.002

LDH pleura/blood ratio

63.0 [15.1 to 101.3]

4.8 [2.6 to 19.5]

0.0005

Glucose (mmol/l)

0.8 [0.3 to 1.1]

1.8 [0.3 to 4.8]

0.08

Pathogens

9/10

23/25

Streptococcus pneumoniae

7/9 (77.8%)

22/23 (95.7%)

0.18

Other Streptococcus

1/9 (11.1%)

1/23 (4.3%)

Staphylococcus aureus*

1/9 (11.1%)

0/0 (0.0%)