Table 2.

Oswestry Disability Index (ODI) scores at the 3 month follow-up

	Classic approach group (CL)	Mini-open approach group (MO)	P
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. (%) patients]	6/15 (40%)	5/15 (33%)	0.77

A higher score means more disability