Table 1 Basic clinical data of the patient cohort.
Variable names and abbreviations | Type | Mean standard deviation or frequency |
|---|---|---|
Age | Continuous (years) | 52.5 (9.5) |
Sex | Binary (Female/Male) | 161 (50.6)/157 (49.4) |
BMI | Continuous (kg/m2) | 24.5 (2.9) |
Duration of symptoms | Continuous (months) | 5.7 (4.5) |
Smoking history (SH) | Binary (Yes/No) | 129 (40.6) |
Drinking history (DH) | Binary (Yes/No) | 106 (33.3) |
Diabetes | Binary (Yes/No) | 55 (17.3) |
Hypertension | Binary (Yes/No) | 104 (32.7) |
Radiographic parameters | ||
Mono-segment (MoS) | Binary (Yes/No) | 89 (28.0) |
Multi-segment (≥ 2) (MuS) | Binary (Yes/No) | 229 (72.0) |
Dural ossification (DO) | Binary (Yes/No) | 91 (28.6) |
Indicators of spinal canal encroachment | ||
The residual rate of spinal canal area (RrSCA) | Continuous (%) | 56.0 (15.9) |
The residual rate of diameter of the canal of on The midline (RrDCM) | Continuous (%) | 60.5 (15.3) |
The residual rate of transverse and anteroposterior diameter (RrTAD) | Continuous (%) | 52.8 (8.0) |
The residual rate of paramedian diameter (RrPD) | Continuous (%) | 46.8 (9.6) |
The residual rate of the sagittal diameter (RrSD) | Continuous (%) | 43.8 (10) |
Sato classification of OLF | ||
Lateral type (LaT) | Binary (Yes/No) | 38 (11.9) |
Extended type (ExT) | Binary (Yes/No) | 54 (17.0) |
Enlarged type (EnT) | Binary (Yes/No) | 59 (18.6) |
Fused type (FuT) | Binary (Yes/No) | 68 (21.4) |
Tuberous type (TuT) | Binary (Yes/No) | 99 (31.1) |
Surgical procedure | ||
Decompression instrument | ||
Conventional bone chisels | Binary (Yes/No) | 121 (38.1) |
High speed drill | Binary (Yes/No) | 102 (32.1) |
Piezosurgery | Binary (Yes/No) | 95 (29.8) |
Intraoperative blood loss, IBL | Continuous (mL) | 517.5 (220.0) |
Operation time, OT | Continuous (mins) | 222.8 (61.7) |
