Table 3.

Rates of screen-detected cancers, interval cancers, false positives and accuracy measures by study period

	Screening mammograms	Screen-detected cancers		Interval cancers		Recall rate		False-positives		Sensitivity	Specificity	Positive predictive value
		n	%	n	%	n	%	n	%
1st SFM period	20,760	86	0.41	27	0.13	1,225	5.90	1,026	4.94	76.11	95.03	7.73
2nd SFM period	20,757	72	0.35	21	0.10	1,132	5.45	970	4.67	77.42	95.31	6.91
3rd SFM period	20,729	102	0.49	39	0.19	1,186	5.72	1,039	5.01	72.34	94.95	8.94
4th SFM period	20,714	85	0.41	27	0.13	1,084	5.23	934	4.51	75.89	95.47	8.34
1st FFDM period	19,733	81	0.41	42	0.21	815	4.13	678	3.44	65.85	96.54	10.67
2nd FFDM period	19,760	91	0.46	27	0.14	960	4.86	800	4.05	77.12	95.93	10.21
3rd FFDM period	19,780	80	0.40	22	0.11	750	3.79	594	3.00	78.43	96.98	11.87
4th FFDM period	19,701	87	0.44	21	0.11	788	4.00	600	3.05	80.56	96.94	12.66