Table 2.

Difference of radiographic parameters between one- and two-level osteotomy groups

Parameters	Groups	Preoperative	Postoperative	Final Follow-up	Correction	Loss of Correction
PT	One-level	37.4 ± 12.0	26.4 ± 11.5	31.7 ± 10.6	11.1 ± 10.6†	5.3 ± 5.9
	Two-level	36.0 ± 13.4	26.0 ± 9.7	34.3 ± 12.0	11.2 ± 11.6†	8.2 ± 5.6
PI	One-level	46.0 ± 12.4	45.5 ± 12.1	44.6 ± 10.8	0.4 ± 3.4	0.9 ± 4.1
	Two-level	49.9 ± 14.0	49.8 ± 12.0	50.0 ± 9.8	0.1 ± 4.6	0.2 ± 3.4
SS	One-level	8.5 ± 11.9*	19.2 ± 10.8	13.0 ± 13.2	10.7 ± 9.7†	6.2 ± 7.7
	Two-level	14.4 ± 13.1*	23.8 ± 11.6	15.8 ± 7.5	9.3 ± 12.1†	8.0 ± 5.5
LL	One-level	7.4 ± 21.7*	−35.8 ± 16.0	−33.4 ± 18.9	43.3 ± 17.5†	2.5 ± 8.4
	Two-level	18.9 ± 21.9*	−30.1 ± 22.9	−25.5 ± 19.6	49.0 ± 21.4†	4.6 ± 5.3
TK	One-level	54.3 ± 16.2*	50.0 ± 15.8	52.9 ± 10.7	4.3 ± 11.4*, †	2.9 ± 5.5
	Two-level	65.0 ± 17.2*	44.3 ± 19.7	45.6 ± 21.4	20.6 ± 20.1*, †	1.3 ± 3.8
GK	One-level	90.2 ± 11.7*	35.9 ± 14.2	42.2 ± 16.0*	54.2 ± 13.8*, †	6.3 ± 7.8
	Two-level	110.2 ± 20.6*	32.0 ± 18.6	31.7 ± 15.5*	78.2 ± 24.3*, †	0.3 ± 6.4
SVA	One-level	23.9 ± 9.3*	9.2 ± 5.9*	7.6 ± 5.1	14.7 ± 7.0*, †	1.5 ± 4.1
	Two-level	31.4 ± 7.2*	11.9 ± 6.1*	10.8 ± 7.7	19.5 ± 6.6*, †	1.1 ± 4.1
OVA	One-level	-	47.4 ± 13.0*	45.3 ± 13.3*	-	2.1 ± 2.9
	Two-level	-	72.4 ± 15.1*	72.0 ± 14.6*	-	0.4 ± 5.9
CBVA	One-level	41.7 ± 26.2*	8.6 ± 11.4	6.9 ± 9.4	33.1 ± 22.4*, †	1.7 ± 10.8
	Two-level	83.1 ± 33.3*	10.8 ± 12.2	6.9 ± 10.1	72.4 ± 30.1*, †	3.9 ± 5.4

PT pelvic tilt, PI pelvic incidence, SS sacral slope, LL lumbar lordosis, TK thoracic kyphosis, GK global kyphosis, SVA sagittal vertical axis, OVA osteotomized vertebra angle, CBVA chin-brow vertical angle

^* Indicates a statistically significant difference between one- and two-level osteotomy groups (P < 0.05)

^† Indicates a statistically significant difference between preoperative and postoperative values (P < 0.05)