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Table 3 Results of Poisson regression analysisa

From: Hospital characteristics related to the hospital length of stay among inpatients receiving invasive cervical discectomy due to road traffic accidents under automobile insurance in South Korea

Variables

Length of stay

RRb

95% CI

P-value

Inpatient-level variables

 Sex

  Male

1.000

 

-

  

  Female

0.974

0.871

-

1.090

0.6480

Age

0.997

0.993

-

1.002

0.2906

 Principal diagnosis (ICD-10)

  Cervical disc disorders (M50)

1.000

 

-

  

  Fracture of neck (S12)

1.261

1.040

-

1.528

0.0182

  Dislocation, sprain and strain of joints and ligaments at neck level (S13)

1.254

1.035

-

1.518

0.0207

  Injury of nerves and spinal cord at neck level (S14)

1.509

1.242

-

1.835

<.0001

  Others

1.642

1.352

-

1.995

<.0001

 Cervical spine surgery performed with cervical discectomy

  None

1.000

 

-

  

  Arthrodesis

1.254

0.931

-

1.691

0.1367

  Corpectomy or corpectomy + arthrodesis

1.674

1.180

-

2.374

0.0039

 Charlson Comorbidity Index

  0

1.000

 

-

  

  1

1.227

1.072

-

1.404

0.0030

  2

1.331

1.139

-

1.557

0.0003

   ≥ 3

1.543

1.285

-

1.853

<.0001

 Other surgical procedures during hospitalization

  Not received

1.000

 

-

  

  Received

1.413

1.287

-

1.552

<.0001

 Study period

  2014, January-June

1.000

 

-

  

  2014, July-December

0.912

0.811

-

1.027

0.1278

  2015, January-June

0.790

0.697

-

0.896

0.0002

  2015, July-December

0.768

0.671

-

0.879

0.0001

Hospital-level variables

 Proportion of inpatients with automobile insurance (%)

1.027

1.012

-

1.042

0.0005

 Volume of invasive cervical discectomy (per 10 case increase)

0.970

0.945

-

0.997

0.0224

 Bed turnover rate

0.988

0.979

-

0.997

0.0076

 Number of neurosurgeons or orthopedic specialists per 100 beds

0.930

0.876

-

0.987

0.0161

 Number of beds

0.977

0.964

-

0.990

0.0007

Types of hospital

 Hospital (N = 40)

1.000

 

-

  

 General hospital (N = 118)

1.205

0.930

-

1.562

0.1585

Area

 Metropolitan (N = 107)

1.000

 

-

  

 Non-metropolitan (N = 51)

0.997

0.895

-

1.110

0.9520

  1. ICD International classification of diseases, RR rate ratio, CI confidence interval
  2. aAll variables in the table were simultaneously adjusted
  3. bThe RRs (rate ratios) indicate the results of exponentiated coefficients and can be interpreted as percentage changes
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BMC Health Services Research

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