Table 3:

Proportion of patients at each follow-up visit by qualitative response

Procedure Location, Response Definition	VNPS			RMDI
Procedure Location, Response Definition	Immediate	2 week	2 month	2 week	2 month
All patients	(n = 218)	(n = 171)	(n = 119)	(n = 171)	(n = 119)
>50% Improvement	66.10%	35.10%	39.50%	22.80%	35.30%
Complete relief	41.06%	16.90%	17.50%	–	–
No improvement/worsening	12.84%	30.40%	29.40%	36.80%	32.80%
Anterolateral^a	(n = 69)	(n = 50)	(n = 32)	(n = 50)	(n = 32)
>50% Improvement	71.01%	42.00%	37.50%	26.00%	31.30%
Complete relief	50.65%^b	14.00%	15.60%	–	–
No improvement/worsening	11.59%	32.00%	31.30%	44.00%	37.50%
Posterior^a	(n = 149)	(n = 121)	(n = 87)	(n = 121)	(n = 87)
>50% Improvement	63.76%	32.20%	40.20%	21.50%	36.80%
Complete relief	36.69%^b	18.00%	18.20%	–	–
No improvement/worsening	13.42%	29.80%	28.70%	33.90%	31.00%

↵a Comparison of anterolateral vs posterior approach P values >.05, unless indicated.
↵b Comparison of immediate complete relief between anterolateral and posterior approach, P value = .039.