Table 4.

Comparison of VAS, ODI and corrections between GI and GII

Items	PVP GI ($n=$ 27)	PSSF GII ($n=$ 33)	$P$ value
Vas pre	7.78 $\pm$ 1.09	7.78 $\pm$ 1.19	0.97
Vas 1 w post-	3.00 $\pm$ 0.82	4.33 $\pm$ 1.08	0.03${}^{*}$
Correction	4.78 $\pm$ 1.09	3.45 $\pm$ 1.52	0.04${}^{*}$
Vas 3 m post-	2.59 $\pm$ 0.57	3.36 $\pm$ 0.93	0.008${}^{*}$
Correction	5.19 $\pm$ 1.21	4.42 $\pm$ 1.23	0.031${}^{*}$
Vas 2 y post-	1.59 $\pm$ 0.84	2.24 $\pm$ 1.03	0.067
Correction	6.18 $\pm$ 1.27	5.54 $\pm$ 1.46	0.34
ODI pre (%)	76.46 $\pm$ 7.83	74.34 $\pm$ 5.90	0.87
ODI 2 y post- (%)	30.37 $\pm$ 3.02	23.50 $\pm$ 5.64	0.01${}^{*}$
Correction (%)	46.09 $\pm$ 8.33	50.84 $\pm$ 7.79	0.029${}^{*}$

Note: The description of statistics are Mean $\pm$ SD. (${}^{*}$ 0.05); Correction: D-value between pre- and specific time point postoperative. Pre-: preoperative; 1 w post-: 1 weeks postoperative; 3 m post-: 3 months postoperative; 2 y post-: 2 years postoperative.