Table 3.

Comparison of VAS scores between 2 groups of patients.

	VAS score
Groups	Preoperative	6 mo after operation	12 mo after operation
Observation group	7.00 ± 1.23	2.27 ± 1.04	1.53 ± 0.73
Control group	7.27 ± 1.26	2.80 ± 0.92	2.03 ± 0.81
χ2/t value	−0.830	−2.090	−2.513
P-value	.410	.041	.015