Table II.

The comparison of the time of operation, cadaverine quantity of bleeding during operation, average length of incision and the time in bed after operation.

Groups	The time of operation (min)	Cadaverine quantity of bleeding during operation (ml)	Average length of incision (cm)	The time in bed after operation (days)
PELD	78.7±13.4	50.6±18.3	0.8±0.2	1.3±0.5
MED	76.6±15.5	100.7±46.5	1.7±0.6	4.6±0.7
t-test	0.676	5.325	5.854	5.621
P-value	0.324	0.024	0.020	0.022

PELD, percutaneous endoscopic lumbar discectomy; MED, microendoscopic discectomy.