Table 2.

Comparison of intraoperative data between the two operations.

Variables	UBE (N = 42)	OLD (N = 40)	P-value
Operative time (min)	151.67 ± 9.82	93.42 ± 5.02	<0.001**
EBL (ml)	46.19 ± 25.25	147.63 ± 26.55	<0.001**
Length of hospital stay (days)	4.38 ± 1.56	7.58 ± 1.39	<0.001**
Creatine Kinase (U/L)
Preop	61.38 ± 7.14	61.3 ± 8.48	0.521
Postoperative day 1	108.1 ± 12.17	364.13 ± 20.24	<0.001**
Postoperative day 7	61.81 ± 7.14	66.10 ± 8,26	0.014*
Perioperative complications, n(%)	2	5	0.235
Dural sac tearing	2 (4.8%)	3 (7.5%)
Incision infection	0	2 (5%)

Values are presented as mean ± standard deviation. EBL, estimated blood loss. *p < 0.05, **p < 0.001.