Table 4:

Clinical associations of clival invasion

	Operation Approaches		Resection Extent		Operative Complications	Follow-Up		Recurrence
	Transsphenoidal	Transfrontal	Gross Total	Subtotal	Operative Complications	Cases	Period (mo)	Recurrence
Clival destruction	26/32 (81.25%)	6/32 (18.75%)	0	32	5/32 (15.63%)	14	6.78 ± 2.91	8/14 (57.14%)
Without clival destruction	330/358 (92.18%)	28/358 (7.82%)	99	259	13/358 (3.63%)	56	8.58 ± 3.16	7/56 (12.50%)
χ²	χ² = 3.142,				χ² = 7.067		P < .001^a	χ² = 10.739
P	P = .076				P = 0.008			P = .001

a Two independent-samples t test.