Table 2 Cervical sagittal parameters on X-ray in the two groups (\( \overline{x} \) ± SD)
Item | Group A (n = 42) | Group B (n = 37) | t value | P value |
|---|---|---|---|---|
C2-7 SVA (mm) | ||||
Before surgery | 20.3 ± 6.9 | 20.1 ± 5.4 | 0.856 | 0.394 |
At 1 month after surgery | 34.8 ± 5.7 | 33.9 ± 5.1 | 1.767 | 0.085 |
At 2 years after surgery | 22.4 ± 4.1 | 24.9 ± 4.7 | 3.113 | 0.002 |
F value * | 6.978 | 161.014 | ||
P value* | 0.006 | 0.000 | ||
C2-7 Cobb angle (°) | ||||
Before surgery | 21.4 ± 6.6 | 21.1 ± 5.8 | 0.834 | 0.406 |
At 1 month after surgery | 14.8 ± 3.8 | 14.2 ± 3.3 | 0.799 | 0.426 |
At 2 years after surgery | 19.5 ± 6.3 | 18.5 ± 5.1 | 1.693 | 0.093 |
F value * | 124.228 | 49.836 | ||
P value* | 0.000 | 0.001 | ||
T1 Slope (°) | ||||
Before surgery | 24.7 ± 2.4 | 24.4 ± 3.8 | 1.025 | 0.307 |
At 1 month after surgery | 33.2 ± 3.5 | 32.9 ± 3.2 | 1.166 | 0.246 |
At 2 years after surgery | 26.5 ± 2.7 | 28.1 ± 3.1 | 1.814 | 0.072 |
F value * | 26.133 | 33.135 | ||
P value* | 0.001 | 0.000 | ||