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Table 1 General characteristics of the study population

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 N/Mean (%)/±SD
Inpatient-level variables
 Sex
  Male 664 (78.1)
  Female 186 (21.9)
Age 51.14 ±13.41
 Principal diagnosis (ICD-10)
  Cervical disc disorders (M50) 103 (12.1)
  Fracture of the neck (S12) 210 (24.7)
  Dislocation, sprain and strain of joints and ligaments at the neck level (S13) 228 (26.8)
  Injury of nerves and the spinal cord at the neck level (S14) 152 (17.9)
  Others 157 (18.5)
 Cervical spine surgery performed with cervical discectomy
  None 30 (3.5)
  Arthrodesis 781 (91.9)
  Corpectomy or corpectomy + arthrodesis 39 (4.6)
 Charlson Comorbidity Index
  0 306 (36.0)
  1 239 (28.1)
  2 138 (16.2)
  ≥ 3 167 (19.7)
 Other surgical procedures during hospitalization
  Not received 484 (56.9)
  Received 366 (43.1)
 Study period
  2014, January-June 251 (29.5)
  2014, July-December 221 (26.0)
  2015, January-June 210 (24.7)
  2015, July-December 168 (19.8)
Hospital-level variables
Proportion of inpatients with automobile insurance (%) 3.67 ±3.36
Volume of invasive cervical discectomy 24.42 ±25.26
Bed turnover rate 32.07 ±7.26
Number of neurosurgeons/orthopedic specialists per 100 beds 2.56 ±1.22
Number of beds 879.09 ±476.82
Types of hospital
 Clinic or hospital (N = 40) 53 (6.2)
 General hospital (N = 118) 797 (93.8)
 Area
 Metropolitan (N = 107) 613 (72.1)
 Non-metropolitan (N = 51) 237 (27.9)
Total 850 (100.0)
  1. ICD International classification of diseases, SD standard deviation