Table 2.

Radiographic and Patient Data (8.0 – 10.9 Years Old Cohort)

	Parameter	Index surgical procedure				p
		Definitive fusion		Growth sparing
		N	Mean (range)	N	Mean (range)
Preoperative	Major curve cobb	18	75 (47–105)	13	82 (47–137)	0.2
	T1-12 height (mm)	18	167 (135–215)	13	161 (83–201)	0.5
	T1-S1 length (mm)	18	295 (233–354)	13	275 (186–341)	0.003
	Max kyphosis	18	47 (5–75)	13	42 (14–114)	0.2
	Age at surgery (years)	18	9.5 (8.1–10.9)	13	8.6 (8.1–10)	0.01
	Curve levels	18	12.6 (5–15)	13	13.7 (11–19)	0.4
Radiographic follow-up	Age (years)	18	14.6 (11.1–17.8)	13	13.9 (11.2–18.5)	0.8
	Time since surgery (months)	18	61 (26–101)	13	63 (36–123)	0.8
	Major curve cobb	18	29 (4–50)	13	28 (13–52)	0.4
	T1-12 height (mm)	18	201 (162–241)	13	209 (156–247)	0.1
	T1-S1 length (mm)	18	341 (271–446)	13	352 (297–397)	0.4
	Max kyphosis	18	37 (18–55)	13	29 (7–50)	0.005
	Instrumented levels	18	13.1 (5–18)	13	14.1 (11–19)	0.4
	Additional surgeries	18	0.6 (0–4)	13	3.2 (0–8)	< .001
PFT follow-up	Age (years)	18	13.8 (11.1–17.8)	13	13.2 (10.9–15.8)	0.5
	Time since surgery (months)	18	51 (26.7–84.9)	13	55 (30.1–90.1)	0.011
	FVC actual	18	1.8 (0.8–2.6)	13	1.7 (0.3–3.4)	0.4
	FVC percent predicted	18	56 (27–79)	13	51 (14–101)	0.8
	FEV1 actual	18	1.5 (0.7–2.3)	13	1.5 (0.3–3.1)	0.3
	FEV1 percent predicted	18	54 (30–77)	13	52 (14–111)	0.2
Changes at follow-up	% Correction major curve cobb		60 (25–94)		64 (32–80)	0.008
	Change in T1–12 height (mm)		34 (− 6 to 76)		48 (20–101)	0.2
	Change in T1-S1 length (mm)		46 (11–118)		77 (43–146)	0.004
	Change in levels		0.7 (0–5)		0.6 (0–4)	0.9
	ΔFVC actual		0.68 (0.05–1.73)		0.78 (0.07–1.92)	0.8
	ΔFVC % predicted		− 3.91 (− 63 to 54)		-3.4 (-32–27)	0.9
	ΔFEV1 actual		0.55 (0.09–1.22)		0.63 (0.07–1.81)	0.8
	ΔFEV1% predicted		− 2.64 (− 24 to 39)		− 5 (− 40 to 36)	0.5