Table 2:

Incidence HIF and AMF/pt., SL incidence, and number of AMFs extending to HIF (AMF>HIF) in Chiari I without an operation versus patients having undergone postdecompressive craniectomy

	HIF		AMF		SL	AMF>HIF
	%	HIF/Pt.	%	AMF/Pt.	No. (%)	No.
Chiari I no surgery (n = 15)	100	8.9	100	4.0	5 (33%)^{^a}	1.9^{^b}
Chiari I post-op (n = 10)	100	8.1	90	4.3	8 (80%)^{^a}	2.8^{^b}

Note:—Post-op indicates postoperative.
↵a P = .009.
↵b P = .07.