Table 1. Numbers of Enrolled Cases by Hospitals and Years in Alliance for Breast Cancer Screening in Korea (ABCS-K).

No. of Hosp.	Raw Data	Excluded Cases			Enrolled Cases
		Incomplete ID	Prevalent Cancer Cases	IMP	Calendar Year						Total (%)
					2005	2006	2007	2008	2009	2010
1	28718	99	88	9	3605	4039	4056	5371	6331	5120	28522 (22.2)
2	23021	407	68	5	2811	3254	3215	4032	4805	4424	22541 (17.5)
3	14883	138	70	0	718	1127	1159	3181	4290	4200	14675 (11.4)
4	5028	16	48	4	369	660	947	987	1338	659	4960 (3.9)
5	9818	41	54	0	1178	1400	1187	1757	2171	2030	9723 (7.6)
6	14360	151	65	38	1293	1945	2551	2913	2891	2513	14106 (11.0)
7	9843	27	58	22	394	768	1333	2155	2652	2434	9736 (7.6)
8	12149	124	33	4	1582	1533	1881	1883	2184	2925	11988 (9.3)
9	6772	37	29	13	133	1209	1180	1440	1292	1439	6693 (5.2)
10	5945	81	44	8	794	1089	947	1078	1059	845	5812 (4.5)
Total	130537	1121	557	104	2877	17024	18456	24797	29013	26589	128756 (100.0)

ID = identification number of hospital, IMP = interstitial mammoplasty, No. of Hosp. = serial number of hospitals participating in ABCS-K