Table 3. Puncture times of percutaneous transforaminal endoscopic discectomy in different groups.

Puncture levels	Groups	Puncture time (Mean±SD)	P value
L4/L5	Group A	1.55±0.60	-
	Group B	3.65±1.09	<0.001
	Group C	1.70±0.47	0.811
L5/S1	Group A	2.00±0.59	-
	Group B	4.22±1.22	<0.001
	Group C	2.06±0.73	0.981