Table-II.

LBP VAS scores (x̄±SD)

Group	Case number (n)	Preoperative score	Score 3 days after surgery	t	P	Improvement rate	Score 3 months after surgery	t	P	Score 6 months after surgery	t	P
MED	45	6.34±0.72	3.61±0.21	29.657	<0.0001	(47.84±3.51)%	1.73±0.40	94.009	<0.0001	1.65±0.49	26.037	<0.0001
PTED	45	6.40±0.83	2.05±0.37	59.448	<0.0001	(69.89±2.21)%	1.84±0.46	81.554	<0.0001	1.36±0.54	112.623	<0.0001
t	-	-0.770	24.303			-35.66	-1.201			2.684
P	-	0.443	<0.0001			0.001	0.380			0.523