Table 2.

Comparison of clinical data between the MiTLIF and OTLIF groups

	MiTLIF group	OTLIF group
Operating time (min)	156 ± 32	145 ± 27
Intraoperative blood loss (ml)	264 ± 89 **	673 ± 145
Postoperative blood loss (ml)	39 ± 12 **	158 ± 65
Total blood transfusion (U)	0.12 ± 0.3**	1.47 ± 0.52
X-ray time (s)	84 ± 21*	37 ± 19
Hospital stay (days)	10.6 ± 2.5*	14.6 ± 3.8
Preoperative back pain VAS	7.2 ± 2.1	7.4 ± 1.6
Back pain VAS at the third day after surgery	1.34 ± 0.5*	2.49 ± 0.7
Latest back pain VAS	0.92 ± 0.5	1.1 ± 0.6
Preoperative ODI	41.2 ± 6.6	38.5 ± 7.4
Latest ODI	10.8 ± 3.3	12.2 ± 3.9

* P < 0.05; ** P < 0.01