Table 5. Specificity and Trend of Screening Mammography by Hospitals Participating in Alliance for Breast Cancer Screening in Korea.

No. of Hospital	Total	2005	2006	2007	2008	2009	2010	APC	95% CI
1	75.8	40.9	54.1	67.0	83.7	94.4	93.1	18.7	10.8 to 27.2
2	73.5	96.8	62.6	68.1	70.9	72.1	74.6	-2.4	-12.1 to 8.4
3	85.9	93.3	88.4	86.0	87.2	85.8	83.0	-1.9	-3.1 to -0.6
4	85.7	83.1	83.5	87.0	88.1	84.6	86.0	0.6	-0.8 to 2.1
5	89.4	90.0	89.8	87.7	86.7	89.1	92.4	0.3	-1.3 to 1.9
6	85.3	89.5	91.8	89.9	83.1	77.8	84.8	-2.4	-5.4 to 0.7
7	91.2	86.0	88.3	85.5	92.4	94.4	91.7	1.7	-0.2 to 3.6
8	85.1	63.3	79.5	85.3	89.6	89.4	93.7	7.0	1.8 to 12.4
9	73.7	94.0	86.5	74.0	68.1	72.0	67.7	-6.3	-10.2 to -2.2
10	80.3	90.7	85.5	76.9	76.8	77.8	75.0	-3.5	-6.0 to -0.8

APC = annual percent change, CI = confidence interval of the APC