Table 4 Multivariate analysis for investigating risk factors of developing PE, complicated PE and pleural empyema

 Heart Disease

2.88

0.000–0.000

0.998

 Admission via ER

1.69

0.688–4.149

0.252

 Admission to ICU

1.98

0.568–6.900

0.284

 Biliary tract inflammation

1.78

0.757–4.198

0.186

 Urinary tract infection

1.70

0.560–5.150

0.349

 Acute kidney injury

1.85

0.434–7.863

0.406

 Sepsis

2.60

0.688–9.851

0.159

 Total metastatic infections

0.64

0.213–1.894

0.416

 Combined ascites

0.352

  small

1.42

0.573–3.541

0.447

  moderate

6.80

0.705–65.598

0.097

  large

0.79

0.060–10.519

0.860

 Second week follow-up CRP, mg/dL

1.04

1.016–1.061

0.001

 Location associated with diaphragm

0.137

  Near left diaphragm (2, 4)

1.72

0.694–4.259

0.242

  Near right diaphragm (7, 8)

2.30

1.008–5.265

0.048

 Largest diameter of abscess (mm)

1.02

1.001–1.034

0.042

 Admission via ER

0.41

0.120–1.378

0.148

 Initial CRP, mg/dL

1.01

0.999–1.013

0.090

 1st week follow-up CRP, mg/dL

1.00

0.990–1.008

0.830

 2nd week follow-up CRP, mg/dL

1.01

0.993–1.030

0.236

 Culture results of abscess

  K. pneumoniae

1.35

0.296–6.170

0.697

  Other gram(+)

2.70

0.490–14.823

0.254

  Mixed

10.62

1.069–105.411

0.044

 Biliary tract inflammation

21.05

1.152–384.785

0.040

 Urinary tract infection

3.07

0.202–46.678

0.419

 Location of PE

  Right

12.63

0.249–640.051

0.205

  Bilateral

46.72

2.354–927.452

0.012

 Association with diaphragm

0.642

  Near left diaphragm (2, 4)

2.79

0.115–67.482

0.528

  Near right diaphragm (7, 8)

0.50

0.047–5.348

0.567