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Table 2 Distribution of length of stay for each categorical variable

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 p-valuea
Mean ±SD
Inpatient-level variables
 Sex
  Male 26.28 ±22.39 0.2594
  Female 23.83 ±18.96  
 Age
  Less than median (≤52) 23.50 ±20.66 0.0011
  More than median (>52) 28.37 ±22.58  
 Principal diagnosis (ICD-10)
  Cervical disc disorders (M50) 15.54 ±12.28 <.0001
  Fracture of neck (S12) 25.03 ±20.21  
  Dislocation, sprain and strain of joints and ligaments at neck level (S13) 22.66 ±19.80
  Injury of nerves and spinal cord at neck level (S14) 32.51 ±23.20  
  Others 31.32 ±25.78  
 Cervical spine surgery performed with cervical discectomy
  None 17.27 ±13.87 0.0049
  Arthrodesis 25.65 ±21.72  
  Corpectomy or corpectomy + arthrodesis 34.26 ±23.55
 Charlson Comorbidity Index
  0 21.22 ±18.73 <.0001
  1 24.87 ±22.50  
  2 28.36 ±20.22
   ≤ 3 33.14 ±24.50
 Other surgical procedures during hospitalization
  Not received 20.95 ±18.76 <.0001
  Received 32.09 ±23.62  
 Study period
  2014, January-June 28.67 ±23.62 0.0795
  2014, July-December 25.15 ±22.62  
  2015, January-June 24.14 ±19.30
  2015, July-December 24.16 ±19.97
Hospital-level variables (cut-offs denote the median values)
 Proportion of inpatients with automobile insurance (%)
   ≤ 2.8% 23.09 ±19.90 0.0016
   > 2.8% 28.09 ±23.14  
 Volume of invasive cervical discectomy
   ≤ 20.0 27.57 ±21.43 0.0096
   > 20.0 23.71 ±21.83  
 Bed turnover rate
   ≤ 31.8 28.59 ±23.59 <.0001
   > 31.8 22.80 ±19.12  
 Number of neurosurgeons/orthopedic specialists per 100 beds
   ≤ 2.2 28.24 ±24.18 0.0025
   > 2.2 23.63 ±19.11  
 Number of beds
   ≤ 833 28.26 ±21.15 0.0007
   > 833 23.21 ±21.97  
 Types of hospital
  Clinic or hospital (N = 40) 20.06 ±15.52 0.0646
  General hospital (N = 118) 26.12 ±22.00  
 Area
  Metropolitan (N = 154) 24.74 ±21.97 0.0007
  Non-metropolitan (N = 71) 28.34 ±20.80  
Total 25.75 ±21.69  
  1. ICD International classification of diseases, SD standard deviation
  2. aThe results of the analysis of variance