Table 1. Number of screen-detected and interval cancers (by time of diagnosis) with their rates per 1,000 women and 10,000 mammograms and proportions of interval cancer subtypes among radiologically classified interval cancers.

		Rates per 1,000 women	Rates per 10,000 Mammograms	Radiologic information	TI	FN	MS	OT
	N			N	N	N	N	N
Screened women	645,764
Mammograms	1,508,584
Screen-detected cancer	5,307	8.22	35.18	1,570
In successive participations	3,547	5.49	23.54	1,100
Interval cancer	1,653	2.57	10.99	1,012	489	235	174	114
Time of diagnosis*	N (%)			N (%)	N (%)	N (%)	N (%)	N (%)
<12 months	484 (29.3)	0.75	3.21	273 (27.0)	96 (19.6)	76 (32.3)	53 (30.5)	48 (42.1)
12–23 months	992 (60.0)	1.54	6.58	626 (61.9)	322 (65.8)	139 (59.1)	105 (60.3)	60 (52.6)
> = 24 months	177 (10.7)	0.27	1.17	113 (11.2)	71 (14.5)	20 (8.5)	16 (9.2)	6 (5.3)

*Time of diagnosis (in months) for interval cancer is the time between the last mammogram and diagnosis of cancer.

Abbreviations: TI: True interval, FN: False-negative, MS: Minimal-signs, OT: Occult tumours.