Table 1:

Distribution of cases of breast cancer and ductal carcinoma in situ, mammography screenings and population years-at-risk, by age group and period

Period	Age group, yr	Years-at-risk	Mammography screenings, no.	No. of cases
Period	Age group, yr	Years-at-risk	Mammography screenings, no.	Invasive breast cancer	Ductal carcinoma in situ
1970–1979	30–39	1 537 498	0	566	22
	40–49	1 310 140	0	1 821	101
	50–59	1 249 583	0	2 703	106
	60–69	943 503	0	2 483	71
	70–79	558 996	0	1 641	54
	≥ 80	298 675	0	966	30
1980–1989	30–39	2 422 444	56	914	40
	40–49	1 668 976	5 538	2 267	173
	50–59	1 415 857	4 297	2 934	198
	60–69	1 342 795	3 066	4 065	199
	70–79	868 461	796	3 140	159
	≥ 80	428 466	74	1 704	42
1990–1999	30–39	3 192 387	4 180	1 136	106
	40–49	2 782 701	441 338	3 878	638
	50–59	1 842 518	377 433	4 392	691
	60–69	1 521 985	286 919	5 100	657
	70–79	1 228 348	163 148	5 100	513
	≥ 80	659 604	15 653	2 700	133
2000–2009	30–39	3 042 072	3 217	1 132	103
	40–49	3 472 765	871 237	4 790	1 005
	50–59	2 908 523	803 709	6 377	1 279
	60–69	1 893 532	532 565	5 950	1 059
	70–79	1 377 651	300 283	5 055	748
	≥ 80	981 835	12 693	3 375	159