Table 4.

Sub-group analysis of males and females

No.	Variable	Males, n = 9			Females, n = 23
		Pre-op	Post-op	P value	Pre-op	Post-op	P value
1	PT	13.7	13.2	0.571	15.7	17.1	0.660
2	PI	48.6	48.8	0.335	50.1	52.1	0.771
3	SS	34.9	35.5	0.967	34.4	34.9	0.934
4	LL	-49.6	-45.7	0.201	-46.2	-47.0	0.837
5	SVA	50.1	69.6	0.837	32.6	44.5	0.409

LL: Lumbar lordosis; PI: Pelvic incidence; PT: Pelvic tilt; SS: Sacral slope; SVA: Sagittal vertical axis.