Table 1 General characteristics of the study population
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) |