Table 2.

Lithe and reduction rate compared to between two groups (x ± s) (%)

Groups	Spondylolisthesis rate			Reduction rate
	Pre-	Post-	Follow-up	Post-	Follow-up	Lost
PILF	30.1 ± 7.2	7.3 ± 2.1*	8.1 ± 2.8	75.2 ± 6.4	72.6 ± 5.2	3.2 ± 1.1
TILF	31.4 ± 8.3	7.4 ± 2.7*	8.2 ± 2.6**	75.4 ± 6.2	72.4 ± 5.4**	3.4 ± 1.2

* Compared to the pre-operation P < 0.05; ** Compared to PILF P > 0.05