Table 3.

Descriptive and statistical analysis of spinopelvic parameters before and after surgical correction

Variable	Minimum	Maximum	Mean	Std. Deviation	P value
PI-LL preop	21.00	35.00	28.86	3.94	<0.001
PI-LL postop	2.00	21.00	9.04	5.33
PI-LL change	12.00	28.00	19.82	4.44
PT preop	17.00	25.00	19.82	2.60	<0.001
PT postop	10.00	17.00	12.86	2.13
PT change	3.00	13.00	6.82	2.40
SVA preop	5.10	15.10	12.80	1.63	<0.001
SVA postop	1.20	10.80	7.44	2.27
SVA change	3.00	10.50	5.36	1.53
Preop ODI	48.00	74.00	64.00	7.50	<0.001
Postop ODI	28.00	68.00	43.65	10.78
ODI change	.00	36.00	19.56	11.81

PI-LL: pelvic incidence minus lumbar lordosis; PT: pelvic tilt; SVA: sagittal vertical axis; ODI: oswestry disability Index