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Table 2: Differences in diagnostic performance of C-CTA and R-CTA
Variables C-CTA R-CTA OR^{^a} P Values
Subject-based analysis 
    Feeder detection accuracy (%) 
        Observer 1 47 (7/15) 80 (12/15) .025^{^b}
        Observer 2 40 (6/15) 73 (11/15) .025^{^b}
    Time required for diagnosis (sec) 
        Observer 1 97.1 ± 37.4 45.1 ± 23.6 .002^{^b}
        Observer 2 89.5 ± 60.0 45.6 ± 24.1 .020^{^b}
Intervertebral foramen–based analysis 
    Sensitivity (%)^{^c} 44.4 (22.2–66.7) 72.2 (50.0–94.4) 3.26 (0.82–13.0) .095
    Specificity (%)^{^c} 98.1 (97.8–99.5) 99.5 (98.7–100) 3.55 (0.87–14.5) .077
    Accuracy (%)^{^c} 95.6 (93.8–97.2) 98.2 (96.9–99.2) 2.49 (1.04–6.00) .041^{^b}
↵a ORs of R-CTA against C-CTA are shown.
↵b Significant.
↵c 95% Confidence intervals are shown.

Variables	C-CTA	R-CTA	OR^{^a}	P Values
Subject-based analysis
Feeder detection accuracy (%)
Observer 1	47 (7/15)	80 (12/15)		.025^{^b}
Observer 2	40 (6/15)	73 (11/15)		.025^{^b}
Time required for diagnosis (sec)
Observer 1	97.1 ± 37.4	45.1 ± 23.6		.002^{^b}
Observer 2	89.5 ± 60.0	45.6 ± 24.1		.020^{^b}
Intervertebral foramen–based analysis
Sensitivity (%)^{^c}	44.4 (22.2–66.7)	72.2 (50.0–94.4)	3.26 (0.82–13.0)	.095
Specificity (%)^{^c}	98.1 (97.8–99.5)	99.5 (98.7–100)	3.55 (0.87–14.5)	.077
Accuracy (%)^{^c}	95.6 (93.8–97.2)	98.2 (96.9–99.2)	2.49 (1.04–6.00)	.041^{^b}