Table 3.

Linear regression analysis of the effects of preoperative T1 slope on the change from preoperative value in various parameters.

Difference of parameter	R2	Adjusted R2	P*
FSU alignment	0.270	0.246	0.002
UAS alignment	0.035	0.003	0.305
LAS alignment	0.024	−0.008	0.396
C2–C7 alignment	0.490	0.473	<0.001
ROM of FSU	0.063	0.032	0.166
ROM of UAS	0.001	−0.032	0.836
ROM of LAS	0.013	−0.020	0.533
ROM of C2–C7	0.559	0.544	<0.001

FSU – functional spinal unit; UAS – upper adjacent segment; LAS – lower adjacent segment; ROM – range of motion.