Table 5.

Sub-group analysis divided in pure sagittal and sagittal with coronal deformity groups

Variable	Coefficient	p-value	95% Confidence interval
Pure sagittal deformities: Cobb ≤30° (n=57)
Age	-0.25	0.71	1.08 to -1.58
BMI	0.14	0.90	2.28 to -2.00
Sex	6.84	0.61	33.81 to -20.14
Pre- to postoperative changes
SVA	0.15	0.25	0.42 to -0.11
CVAa)	-0.12	0.74	0.58 to -0.82
Cobba)	0.11	0.91	2.06 to -1.84
LL	-0.84	0.04	-0.03 to -1.64
PT	-0.31	0.60	1.46 to -0.85
TK	-0.82	0.18	0.39 to -2.02
LLIF level	6.68	0.28	18.87 to -5.51
PSO	-18.09	0.27	14.60 to -50.78
No. of levels fused	-2.43	0.34	2.68 to -7.53
With coronal deformities: Cobb >30° (n=47)
Age	1.19	0.20	3.02 to -0.64
BMI	-0.35	0.78	2.11 to -2.80
Sex	41.88	0.06	86.03 to -2.28
Pre- to postoperative changes
SVA	0.004	0.97	0.23 to -0.22
CVAa)	0.96	<0.01	1.54 to 0.38
Cobba)	0.60	0.44	2.17 to -0.96
LL	0.26	0.62	1.31 to -0.79
PT	-1.76	0.02	-0.33 to -0.32
TK	-0.79	0.27	0.62 to -2.20
LLIF level	14.11	0.09	30.29 to -2.08
PSO	-25.85	0.41	36.34 to -88.04
No. of levels fused	4.09	0.44	14.82 to -6.63

Boldface indicates statistical significance.

BMI, body mass index; SVA, sagittal vertical axis; CVA, coronal vertical axis; Cobb, coronal Cobb angle; LL, lumbar lordosis; PT, pelvic tilt; TK, thoracic kyphosis; LLIF, lateral lumbar interbody; PSO, pedicle subtraction osteotomy.

^a)CVA and Cobb changes are absolute amounts of change. For example, if a patient tilted 5 mm on the left preoperatively, then tilted 3 mm on the right postoperatively, the CVA change is 8 mm.