Table 1.

Epidemiological characteristics and perioperative results in both groups

	Classic approach group (CL)	Mini-open approach group (MO)	P
No. of patients	15	15
Mean age	42.06 ± 0.6	34.14 ± 8.1	0.78
Gender (M/F) (% male)	11/4 (73%)	9/6 (60%)	0.45
Level L4–L5	5 (33%)	4 (27%)
Level L5–S1	10 (67%)	11 (73%)
Haematocrit preop. (%)	45.8 ± 3.5	43.6 ± 4.0	0.45
Haemoglobin preop.	15.2 + 1.5	14.7 + 1.5	0.66
Vat preop.	7.4 ± 1.9	7.2 ± 1.7	0.87
ODI preop (%)	55.9 ± 10.3	59.1 ± 7.9	0.74
Surgery time (min)	162 ± 33	179 ± 35	0.62
X-ray time (s)	64 ± 21	75 ± 32	0.27
Estimated blood loss (ml)	757 ± 255	318 ± 215	0.002
Drainages (cc)	480 ± 326	269 ± 197	0.69
Haematocrit decrease	13.9 ± 4.8	8.9 ± 4.2	0.02
Haemoglobin decrease	5.0 ± 1.6	3.3 ± 0.6	0.04
Hospital stay (day)	5.2 ± 1.5	3.6 ± 0.6	0.000
Morfic requirements [no. of (%) patients]	6/15 (40%)	5/15 (33%)	0.77