Overdiagnosis in breast cancer screening: the importance of length of observation period and lead time

Duffy, Stephen W; Parmar, Dharmishta

doi:10.1186/bcr3427

Breast Cancer Research

Table 3 Numbers of tumors diagnosed by age and year in a 2-yearly screening program

From: Overdiagnosis in breast cancer screening: the importance of length of observation period and lead time

Age, years	Calendar year
	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
50	1,812	401	1,812	401	1,812	401	1,812	401	1,812	401	1,812	401	1,812	401	1,812	401	1,812	401	1,812	401	401	401	401	401	401	401	401	401	401	401
51	1,863	57	1,863	57	1,863	57	1,863	57	1,863	57	1,863	57	1,863	57	1,863	57	1,863	57	1,863	57	410	410	410	410	410	410	410	410	410	410
52	1,919	59	1,242	59	1,242	59	1,242	59	1,242	59	1,242	59	1,242	59	1,242	59	1,242	59	1,242	59	151	420	420	420	420	420	420	420	420	420
53	1,979	60	1,282	31	1,282	31	1,282	31	1,282	31	1,282	31	1,282	31	1,282	31	1,282	31	1,282	31	155	224	430	430	430	430	430	430	430	430
54	2,045	61	1,326	32	1,119	32	1,119	32	1,119	32	1,119	32	1,119	32	1,119	32	1,119	32	1,119	32	103	228	285	439	439	439	439	439	439	439
55	2,111	65	1,364	34	1,149	25	1,149	25	1,149	25	1,149	25	1,149	25	1,149	25	1,149	25	1,149	25	109	179	302	344	465	465	465	465	465	465
56	2,164	66	1,397	35	1,176	26	1,087	26	1,087	26	1,087	26	1,087	26	1,087	26	1,087	26	1,087	26	89	182	246	351	379	474	474	474	474	474
57	2,224	68	1,433	35	1,204	26	1,112	22	1,112	22	1,112	22	1,112	22	1,112	22	1,112	22	1,112	22	91	158	252	304	387	411	484	484	484	484
58	2,288	70	1,467	36	1,229	27	1,133	23	1,098	23	1,098	23	1,098	23	1,098	23	1,098	23	1,098	23	83	164	231	315	356	425	445	500	500	500
59	2,351	72	1,497	38	1,249	28	1,149	24	1,113	22	1,113	22	1,113	22	1,113	22	1,113	22	1,113	22	86	154	239	296	368	400	460	470	517	517
60	2,408	79	1,516	41	1,261	30	1,157	26	1,119	23	1,112	23	1,112	23	1,112	23	1,112	23	1,112	23	87	167	241	321	371	434	464	511	522	561
61	2,422	81	1,516	42	1,259	31	1,155	26	1,115	24	1,108	24	1,108	24	1,108	24	1,108	24	1,108	24	90	172	249	331	383	447	478	526	538	578
62	2,416	83	1,505	43	1,249	32	1,146	27	1,105	25	1,098	25	1,098	25	1,098	25	1,098	25	1,098	25	92	177	256	341	394	460	492	541	553	595
63	2,385	84	1,485	44	1,234	32	1,133	28	1,094	25	1,087	25	1,087	25	1,087	25	1,087	25	1,087	25	93	179	259	345	399	466	498	548	560	602
64	2,333	85	1,462	44	1,219	33	1,122	28	1,086	25	1,079	25	1,079	25	1,079	25	1,079	25	1,079	25	94	181	262	349	403	471	504	554	566	609
65	2,260	72	1,442	38	1,208	28	1,114	24	1,079	22	1,073	22	1,073	22	1,073	22	1,073	22	1,073	22	80	154	223	296	342	400	428	470	481	517
66	2,286	73	1,456	38	1,218	28	1,123	24	1,088	22	1,081	22	1,081	22	1,081	22	1,081	22	1,081	22	81	156	225	299	346	405	433	476	486	523
67	2,313	74	1,470	38	1,228	28	1,131	24	1,095	22	1,089	22	1,089	22	1,089	22	1,089	22	1,089	22	82	157	227	302	350	408	437	480	491	528
68	2,340	76	1,482	39	1,235	29	1,136	25	1,099	23	1,093	23	1,093	23	1,093	23	1,093	23	1,093	23	84	161	232	309	358	418	447	491	502	540
69	2,360	77	1,487	40	1,237	30	1,136	25	1,098	23	1,092	23	1,092	23	1,092	23	1,092	23	1,092	23	85	164	237	315	365	426	456	501	512	551
70	563	79	203	41	132	30	105	26	94	23	87	23	87	23	87	23	87	23	87	23	87	168	242	322	373	435	466	512	524	563
71	575	575	207	299	135	221	108	188	96	171	89	171	247	329	381	445	89	171	89	171	89	171	247	329	381	445	476	523	535	575
72	586	586	586	305	381	225	305	192	271	174	252	174	252	335	388	453	485	174	252	174	252	174	252	335	388	453	485	533	545	586
73	593	593	593	593	385	439	308	373	274	339	255	339	255	339	393	459	491	540	255	339	255	339	255	339	393	459	491	540	551	593
74	599	599	599	599	599	443	479	377	426	343	397	343	397	343	397	463	496	545	557	343	397	343	397	343	397	463	496	545	557	599
75	496	496	496	496	496	496	397	422	353	384	328	384	328	384	328	384	411	451	461	496	328	384	328	384	328	384	411	451	461	496
76	502	502	502	502	502	502	502	427	447	388	416	388	416	388	416	388	416	457	467	502	502	388	416	388	416	388	416	457	467	502
77	507	507	507	507	507	507	507	507	451	461	420	461	420	461	420	461	420	461	472	507	507	507	420	461	420	461	420	461	472	507
78	513	513	513	513	513	513	513	513	513	467	477	467	477	467	477	467	477	467	477	513	513	513	513	467	477	467	477	467	477	513
79	518	518	518	518	518	518	518	518	518	518	482	518	482	518	482	518	482	518	482	518	518	518	518	518	482	518	482	518	482	518

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ISSN: 1465-542X

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