Table 1.
Preoperative demographic data and overall NDI improvement rate.
| Total (mean [SD]) | C5 (mean [SD]) | C6 (mean [SD]) | C7 (mean [SD]) | C8 (mean [SD]) | p-value | |
|---|---|---|---|---|---|---|
| n | 359 | 48 | 132 | 149 | 30 | |
| Overall NDI improvement rate (%) | 85.5 | 85.4 | 82.6 | 90.6 | 73.3 | |
| Age (years) | 54.7 [10.9] | 60.9 [12.0] | 52.6 [10.9] | 53.4 [9.6] | 59.8 [10.2] | < 0.001 |
| Sex (male, %) | 75.2 | 75.0 | 75.8 | 79.9 | 73.3 | 0.767 |
| BMI (kg/m2) | 23.8 [3.4] | 23.5 [3.2] | 24.0 [3.7] | 23.7 [3.2] | 23.9 [3.5] | 0.873 |
| ASA grade (grade 1:2:3:4, %) | 40:56:3:0 | 29:64:6:0 | 39:60:2:0 | 38:58:5:0 | 80:20:0:0 | < 0.001 |
| Diabetes mellitus (%) | 9.7 | 8.3 | 8.3 | 11.4 | 10.0 | 0.830 |
| Etiology (disc hernia, %) | 31.8 | 33.3 | 40.2 | 27.5 | 13.3 | 0.016 |
| Surgical procedure (PD:ADF:PDF, %) | 72:25:2 | 52:46:2 | 72:27:1 | 79:18:3 | 87:10:3 | 0.002 |
ASA: American Society of Anesthesiologists Classification; ADF: anterior decompression and fusion; BMI: body mass index; NDI: neck disability index; PD: posterior decompression; PDF: posterior decompression and fusion; SD: standard deviation.
Bold values indicate p < 0.05.