. 2014 Apr 25;43(4):20130332. doi: 10.1259/dmfr.20130332

Table 4.

Comparison of true-positive and true-negative values of different cone beam CT field of views (FOVs) for each observer and their reading for small, medium, large and overall sizes

Observer and reading	Accuracy rates	Small			Medium			Large			Overall
Observer and reading	Accuracy rates	FOV₄₀	FOV₆₀	FOV₁₀₀	FOV₄₀	FOV₆₀	FOV₁₀₀	FOV₄₀	FOV₆₀	FOV₁₀₀	FOV₄₀	FOV₆₀	FOV₁₀₀
First observer–first reading	TPR	0.594	0.565	0.478	0.667	0.667	0.583	0.875	0.875	0.750	0.594	0.565	0.478
First observer–first reading	TNR	0.913	0.855	0.899	0.958	0.833	0.875	0.813	0.813	0.875	0.913	0.855	0.899
First observer–second reading	TPR	0.594	0.580	0.536	0.667	0.667	0.667	0.813	0.813	0.750	0.594	0.580	0.536
First observer–second reading	TNR	0.942	0.855	0.913	0.958	0.833	0.875	0.875	0.813	0.875	0.942	0.855	0.913
Second observer–first reading	TPR	0.565	0.551	0.464	0.625	0.625	0.542	0.938	0.750	0.713	0.565	0.551	0.464
Second observer–first reading	TNR	0.913	0.928	0.870	0.917	0.917	0.833	0.938	0.938	0.938	0.913	0.928	0.870
Second observer–second reading	TPR	0.565	0.551	0.493	0.667	0.625	0.583	0.813	0.875	0.750	0.565	0.551	0.493
Second observer–second reading	TNR	0.942	0.942	0.957	0.958	0.875	0.917	0.938	0.938	0.938	0.942	0.942	0.957
Third observer–first reading	TPR	0.565	0.507	0.449	0.625	0.625	0.542	0.875	0.875	0.813	0.565	0.507	0.449
Third observer–first reading	TNR	0.913	0.913	0.899	0.917	0.917	0.917	0.938	0.938	0.875	0.913	0.913	0.899
Third observer–second reading	TPR	0.565	0.507	0.464	0.625	0.625	0.583	0.875	0.875	0.813	0.565	0.507	0.464
Third observer–second reading	TNR	0.913	0.913	0.913	0.917	0.917	0.958	0.938	0.938	0.875	0.913	0.913	0.913
	Median TPR	0.565	0.551	0.471	0.646	0.625	0.583	0.875	0.875	0.750	0.565	0.551	0.471
	Median TNR	0.913	0.913	0.906	0.938	0.896	0.896	0.938	0.938	0.875	0.913	0.913	0.906
Comparison of median of TPR's derived from each observer and reading	(FOV₄₀)	1.000	>0.050	>0.050	1.000	>0.050	>0.050	1.000	>0.05	>0.05	1	>0.050	>0.050
	(FOV₆₀)		1.000	>0.050		1.000	>0.050		1.000	>0.05		1.000	>0.050
	(FOV₁₀₀)			1.000			1.000			1.000			1.000
Comparison of median of TNR’s derived from each observer and reading	(FOV₄₀)	1.000	>0.050	>0.050	1.000	>0.050	>0.050	1.000	>0.050	>0.050	1.000	>0.050	>0.050
	(FOV₆₀)		1.000	>0.050		1.000	>0.050		1.000	>0.050		1.000	>0.050
	(FOV₁₀₀)			1.000			1.000			1.000			1.000

FOV₄₀, 40 × 40 mm field of view; FOV₆₀, 60 × 60 mm field of view; FOV₁₀₀, 100 × 100 mm field of view; TPR, true-positive rate; TNR, true-negative rate.