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Table 2 Correlations between the changes of sagittal alignment parameters following adjacent two-level ACDF

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

 ΔT1sΔC2–7 lordosisΔSAΔC2–7 SVAΔK-line tiltΔNDI
ΔT1sr1.428*.631**.235*.650*.620*
p .037.005.047.042.086
ΔC2–7 lordosisr.428*1.666*− .467**-.023.102
p.037 .022.009.847.382
ΔSAr.631**.666*1− .121.269*− .080
p.005.022 .312.026.592
ΔC2-7SVAr.235*− .467**− .1211.293*.645*
p.047.009.312 .013.048
ΔK–line tiltr.650*− .023.269*.293*1.702**
p.042.847.026.013 .028
ΔNDIr.620*.102− .080.645*.702**1
p.086.382.592.048.028 
  1. T1s T1 slope, SVA sagittal vertical axis, SA segmental angle, NDI neck disability index
  2. *Correlation is significant at the p < 0.05 level (2-tailed)
  3. **Correlation is significant at the p < 0.01 level (2-tailed)