Table 2:

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

Parameter	TP^{^b}	TN^{^b}	FN^{^b}	FP^{^b}	Sensitivity (%)	P Value	Specificity (%)	P Value	PPV (%)	NPV (%)
All sites
CCT alone	66	155	18	25	79 (68–87)	.016^{^c}	86 (80–90)	.010^{^c}	73	90
CCT-plus-BSI	78	172	6	8	93 (85–97)	.016^{^c}	96 (91–98)	.010^{^c}	91	97
Sphenoid body
CCT alone	18	14	4	8	82 (60–95)	.625	64 (41–83)	.039^{^d}	69	78
CCT-plus-BSI	20	21	2	1	91 (71–99)	.625	95 (77–100)	.039^{^d}	95	91
Clivus
CCT alone	11	22	9	2	55 (32–77)	.031^{^d}	92 (73–99)	1.000	85	71
CCT-plus-BSI	17	22	3	2	85 (62–97)	.031^{^d}	92 (73–99)	1.000	89	88
Base of the pterygoid process
CCT alone	17	60	1	10	94 (73–100)	.157	86 (75–93)	.012^{^c}	63	98
CCT-plus-BSI	18	68	0	2	100 (81–100)	.157	97 (90–100)	.012^{^c}	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)	.221	95 (87–99)	.306	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.
↵a Numbers in parentheses are 95% confidence intervals.
↵b Data are numbers of findings.
↵c P < .05, according to the generalized estimating equations that accounted for the multiple observations within patients.
↵d P < .05, as determined with the McNemar test.