Comparison of degenerative lumbar spondylolisthesis and isthmic lumbar spondylolisthesis: effect of pedicle screw placement on proximal facet invasion in surgical treatment

Table 2 Statistical analysis of VAS score before and after operation in the two groups

	Preoperative VAS score	The VAS score was followed up at 1 month	The VAS scores were followed up at 3 months	VAS score at the last follow-up	F	P
Group A	8(7, 8)	4(4, 5)	2(2, 3)	1(1, 2)	2754.643	<0.001
Group B	7(7, 8)	5(4, 5)	3(2, 3)	3(1, 3)	1620.675	<0.001
P	0.145	0.148	0.114	<0.001
Z	-1.458	-1.446	-1.580	-8.630

Note: VAS preoperative scores of the two groups were compared with the 1-month, 3-month and last follow-up VAS scores. P value <0.001.

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