NDI and pain status (% of patients) at last follow-up in 2-level TDR and ACDF.
| NDI | VAS Neck Pain | |||||
|---|---|---|---|---|---|---|
| Status* | TDR | ACDF | P value† | TDR | ACDF | P value† |
| Improved | 80.8% | 70.2% | 0.10 | 86.0% | 77.7% | 0.15 |
| Not improved | 16.5% | 25.9% | 9.0% | 15.5% | ||
| Worse | 2.7% | 3.8% | 5.0% | 6.8% | ||
↵* NDI: Improved: ≥15/100 point increase from baseline. Not improved: < 15 point change (±) from baseline. Worse: ≤ -15/100 point decrease from baseline. Neck pain: Improved: ≥10/100 point increase from baseline. Not improved: < 10 point change (±) from baseline. Worse: ≤ -10/100 point decrease from baseline.
↵† Fisher's exact test.