Table 1.

Demographic data of patients in the growth-friendly and posterior spinal fusion groups

Parameters		Growth-friendly group (n = 12)	Posterior spinal fusion group (n = 24)	p value
Vertebral anomalies	I: formation failures	6	12
	II: segmentation failures	1	2
	III: mixed types	5	10
Age (years)	At index surgery	9.3 (9 to 11)	9.8 (9 to 11)	0.61
	At latest follow-up interval	16.9 (15 to 18)	16.4 (14 to 18)	0.33
Follow-up (years)	Index surgery to definitive spinal fusion	4.6 (2 to 6)
	Definitive spinal fusion to latest follow-up	2.8 (2 to 4)
	Index surgery to follow-up	7.2 (5 to 9)	6.8 (5 to 8)	0.14
Fusion and spanned levels	Distraction periods	13.8 (11 to 15)
	Definitive spinal fusion	14.7 (12 to 16)	12.5 (10 to 15)	0.003

Data are presented as the median (range).