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Table 4 Correlation between the sagittal alignment parameters

From: Increased Neck Tilt/T1 slope ratio may play an important role in patients with cervical kyphosis

  pre-NT/T1s pre-C2-7 Cobb pre-C2-7 SVA ΔC2-7 Cobb ΔC2-7 SVA
pre-NT/T1s r 1 − 0.515** − 0.461** 0.358* 0.230
p   0.001 0.005 0.032 0.178
pre-C2-7 Cobb r − 0.515** 1 0.227 − 0.337* − 0.207
p 0.001   0.183 0.045 0.226
pre-C2-7 SVA r − 0.461** 0.227 1 0.187 − 0.510**
p 0.005 0.183   0.276 0.001
ΔC2-7 Cobb r 0.358* − 0.337* 0.187 1 − 0.047
p 0.032 0.045 0.276   0.784
ΔC2-7 SVA r 0.230 − 0.207 − 0.510** − 0.047 1
p 0.178 0.226 0.001 0.784  
  1. T1s T1 slope, NT neck tilt, SVA sagittal vertical axis
  2. Δvalue = follow-up value minus postoperative value
  3. *Correlation is significant at the P < 0.05 level (2-tailed)
  4. **Correlation is significant at the P < 0.01 level (2-tailed)