Comparison of the pre- and postoperative obex structures. as well as intragroup analyses of the two surgical groups.

Table 7: Comparison of the pre- and postoperative obex structures. as well as intragroup analyses of the two surgical groups.

Surgery Technic			Postoperative Obex				Total
			Unaware		Sees		Total
			Number	Percentage	Number	Percentage	Number	Percentage	p
Suboccipital cranioectomy without duraplasty	Preoperative Obex	Uncertain	6	31.6%	13	68.4%	19	100.0%	< 0.001
	Preoperative Obex	certain	0	0.0%	10	100.0%	10	100.0%	< 0.001
	Total		6	20.7%	23	79.3%	29	100.0%
Suboccipital cranioectomy with duraplasty	Preoperative Obex	Uncertain	1	10.0%	9	90.0%	10	100.0%	0.004
	Preoperative Obex	Certain	0	0.0%	7	100.0%	7	100.0%	0.004
	Total		1	5.9%	16	94.1%	17	100.0%