Safety and efficacy of posterior vertebral column resection in complex pediatric deformities

Egyptian Journal of Neurosurgery

Table 3 Comparison between preoperative and postoperative angles (Cobb and Kyphosis)

	Preoperative	Postoperative		Test of Sig.
	Preoperative	Immediate	After 2 years	Test of Sig.
COBB (21 cases)
Mean ± SD.	82.9 ± 23.9	28.8 ± 14.2	30.2 ± 14.9	Fr = 39.975*
Median (Min.–Max.)	88 (33–140)	29 (7–62)	30 (7–65)
Significance between periods	p₁ < 0.001, p₂ < 0.001
Correction rate and correction loss %	66.9 ± 10.8 4.3 ± 3.1
KYPHOSIS (7cases)
Mean ± SD.	74.1 ± 15.9	25.4 ± 4.5	26.7 ± 5.2	F = 118.964*
Median (Min.–Max.)	66 (60–100)	23 (20–33)	25 (20–35)
Significance between periods	p₁ < 0.001, p₂ < 0.001
Correction rate and correction loss %	65.4 ± 2.9 4.8 ± 3.5

Correction rate and loss are bold because as they are the most important information in the table
F: F test (ANOVA) with repeated measures, significance between periods was done using post hoc test (adjusted Bonferroni)
Fr: Friedman test, Sig. bet. periods was done using post hoc test (Dunn's)
p₁: p value for comparing between preoperative and immediate postoperative period
p₂: p value for comparing between preoperative and 2-year postoperative period
*Statistically significant at p ≤ 0.05