Table 2 The results of the independent sample t-test to find out if there were break points (significant differences in the deformity correction) between the first period i.e. at the end of 2006 compared with 2007-2009
Difference between the pre- and the postoperative measures of: | Mean difference period 1 against period 2-4 | 95% CI | P-value | |
|---|---|---|---|---|
Lower bound | Upper bound | |||
Cobb angle | 1.5° | -5.1° | 2.2° | 0.425 |
LEVT | 1.5° | -4.3° | 1.3° | 0.298 |
Restoration of thoracic kyphosis | 5.9° | 3° | 8.7° | < 0.001 |
Vertebral rotation | 3.2° | 4.7° | 1.7° | < 0.001 |