Table 1.

Screening performance indicators for screen-film mammography and digital mammography

	Screen-film mammography		Digital mammography		p valuea
	n	%	n	%
Screened womenb	39,182		43,406
Screening mammograms	82,961		79,031
Initial screening	21,187		14,532
Successive screening	61,774		64,499
Cancer detection rate	345	0.42	339	0.43	0.685
Initial screening	82	0.39	80	0.55	0.024
Successive screening	263	0.43	259	0.40	0.503
Invasive carcinomas detection rate	295	0.36	264	0.33	0.462
Initial screening	66	0.31	61	0.42	0.091
Successive screening	229	0.37	203	0.31	0.089
In situ carcinoma detection rate	45	0.05	70	0.09	0.010
Initial screening	12	0.06	18	0.12	0.031
Successive screening	33	0.05	52	0.08	0.063
Interval cancer ratec	114	0.14	112	0.14	0.816
Initial screening	39	0.18	32	0.22	0.447
Successive screening	75	0.12	80	0.12	0.895
Recall rate	4,628	5.57	3,316	4.20	<0.001
Initial screening	2,331	11.00	1,705	11.73	0.032
Successive screening	2,297	3.72	1,611	2.50	<0.001
False-positive for any proceduresd	3,970	4.79	2,675	3.38	<0.001
Initial screening	1,872	8.84	1,165	8.02	0.006
Successive screening	2,098	3.40	1,510	2.34	<0.001
Sensitivity		75.16		75.17	0.960
Initial screening		67.77		71.43	0.877
Successive screening		77.81		76.40	0.921
Specificity		95.19		96.60	0.040
Initial screening		91.11		91.92	0.578
Successive screening		96.59		97.65	0.175
Positive predictive value		8.00		11.25	<0.001
Initial screening		4.20		6.43	0.010
Successive screening		11.14		14.64	0.004

^aChi-square test

^bThe total number of screened women is not the sum of women screened with screen-film and full-field digital mammography, because some women were screened during both periods (n = 23,126)

^cThe interval cancer rate was calculated as the number of interval cancers over the number of screened women minus women with screen-detected cancer in the same period

^dNoninvasive and invasive procedures