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 |