Table 4.

Mean peridural fibrosis grade and standard deviation values of groups, with p values.

Group	n	Mean	SD	P	P A-L	P O-L	P F-L	P O-A	P F-A
Ostene (O)	8	0.75	0.46	0.001	0.001	0.001	0.001	0.282	0.968
Floseal (F)	8	0.37	0.51	0.001
Adcon-L (A)	8	0.25	0.46	0.001
Laminectomy (L)	8	2.25	0.7	0.001