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Table 3 Correlations between sagittal parameters and NDI scores

From: Analysis of a radiographic parameter K-line tilt following adjacent two-level anterior cervical discectomy and fusion: a retrospective study

 Sagittal parametersCorrelation (Spearman r)p value
Preoperative NDI scoresPreoperative T1s0.6520.072
Preoperative C2–7 lordosis0.0900.451
Preoperative SA-0.0780.517
Preoperative C2–7 SVA0.639*0.011
Preoperative K-line tilt0.516*0.026
Follow-up NDI scoresFollow-up T1s0.664*0.038
Follow-up C2–7 lordosis0.1170.326
Follow-up SA-0.0650.585
Follow-up C2–7 SVA0.756**0.004
Follow-up K-line tilt0.832**0.006
  1. NDI neck disability index, T1s T1 slope, SA segment angle, SVA sagittal vertical axis
  2. *Correlation is significant at the p < 0.05 level (2-tailed)
  3. **Correlation is significant at the p < 0.01 level (2-tailed)