Table 1.

Risk factor analysis of factors affecting the stereotactic biopsy diagnostic yield

		Diagnostic Yield	OR	CI	p value
Age	<40	75.9% (41/54)	0.33	0.15 - 0.70	< .01
	> or = 40	90.6% (212/234)
Gender	Male	86.2% (137/159)	0.70	0.34 - 1.45	> .05
	Female	89.9 % (116/129)
Lesion enhancement	non-enhancing	82.5% (33/40)	0.54	0.22 - 1.35	> .05
	enhancing	89.7% (218/234)
History of brain radiation	with	69.7% (23/33)	0.25	0.11 - 0.58	< .001
	without	90.2% (230/255)
History of brain surgery	with	75.9% (44/58)	0.32	0.15 - 0.67	< .01
	without	90.9% (209/230)
Prior non-diagnostic biopsy	with	55.6% (10/18)	0.14	0.05 - 0.38	< .001
	without	90.0% (243/270)