TABLE 4.

Comparison of Full-Field Digital and Screen-Film Mammographic Techniques in Detecting Phantom Breast Masses of Various Densities

Mass Density	Imaging System	Sensitivity	Specificity	PPV	NPV	Accuracy	AUC	p-
Low	FFDM	0.741	0.822	0.661	0.961	0.814	0.484	0.085
	SFM	0.748	0.685	0.498	0.954	0.696	0.414
High	FFDM	0.988	0.829	0.751	0.998	0.847	0.714	< 0.001
	SFM	0.995	0.697	0.587	0.998	0.731	0.621

Note—For calculation of sensitivity, specificity, PPV, NPV, and accuracy, confidence level scores of 3, 4, and 5 were considered positive for each imaging system, and confidence level scores of 1 and 2 were considered negative for each imaging system. All p values were calculated based on the difference in AUC between the two mammographic systems using a paired-sample Student’s t test. PPV = positive predictive value, NPV = negative predictive value, AUC = area under the receiver operating characteristic curve, FFDM = full-field digital mammography, SFM = screen-film mammography.