Table 2:

Comparison between CCT images alone and CCT-plus-BSI images of skull base invasion^a

Parameter	TPb	TNb	FNb	FPb	Sensitivity (%)	P Value	Specificity (%)	P Value	PPV (%)	NPV (%)
All sites
CCT alone	66	155	18	25	79 (68–87)	.016c	86 (80–90)	.010c	73	90
CCT-plus-BSI	78	172	6	8	93 (85–97)		96 (91–98)		91	97
Sphenoid body
CCT alone	18	14	4	8	82 (60–95)	.625	64 (41–83)	.039d	69	78
CCT-plus-BSI	20	21	2	1	91 (71–99)		95 (77–100)		95	91
Clivus
CCT alone	11	22	9	2	55 (32–77)	.031d	92 (73–99)	1.000	85	71
CCT-plus-BSI	17	22	3	2	85 (62–97)		92 (73–99)		89	88
Base of the pterygoid process
CCT alone	17	60	1	10	94 (73–100)	.157	86 (75–93)	.012c	63	98
CCT-plus-BSI	18	68	0	2	100 (81–100)		97 (90–100)		90	100
Petrous apex
CCT alone	20	59	4	5	83 (63–95)	.221	92 (83–97)	.306	80	94
CCT-plus-BSI	23	61	1	3	96 (79–100)		95 (87–99)		88	98

Note:—FN indicates false-negative findings; FP, false-positive findings; NPV, negative predictive value; PPV, positive predictive value; TN, true-negative findings; TP, true-positive findings.

^aNumbers in parentheses are 95% confidence intervals.

^bData are numbers of findings.

^cP < .05, according to the generalized estimating equations that accounted for the multiple observations within patients.

^dP < .05, as determined with the McNemar test.