Table 2.

Clinical outcomes of the two groups

Time	Parameter	Group U	Group B	p-value
		N = 24	N = 26
Preoperative	VAS	8.1 ± 1.0	8.0 ± 1.2	0.78
	ODI	45.2 ± 5.1	43.2 ± 4.1	0.13
	PCS	31.6 ± 4.9	29.1 ± 3.7	0.13
	MCS	31.2 ± 3.9	32.1 ± 3.1	0.41
Three days	VAS	2.6 ± 0.8*	2.5 ± 0.9†	0.73
postoperative
	ODI	27.3 ± 4.2*	26.1 ± 3.4†	0.28
	PCS	44.8 ± 5.2*	42.6 ± 4.5†	0.11
	MCS	41.0 ± 3.8*	40.1 ± 4.2†	0.43
Two years	VAS	2.1 ± 0.9*	2.1 ± 0.7†	0.97
postoperative
	ODI	19.9 ± 4.6*	18.9 ± 2.6†	0.26
	PCS	52.9 ± 3.7*	52.8 ± 5.5†	0.93
	MCS	45.7 ± 3.8*	45.3 ± 3.7†	0.74

Group U: PVP through unipedicular approach

Group B: PVP through bipedicular approach

VAS visual analogue scale; ODI oswestry disability index;PCS physical component summary; MCS mental component summary

P values for between-group comparison were determined by t tests

*P = 0.000, compared to Preoperative outcomes in Group U

†P = 0.000, compared to Preoperative outcomes in Group B