Table 3.

Breast cancer Year 1 and 2‐year incidence rates according to stage at diagnosis and study group

Outcome	Intervention			Control
	Cases	Person‐years	Crude rate (95% CI per 100,000)	Cases	Person‐years	Crude rate (95% CI per 100,000)	Incidence ratio
Year 1 follow‐up
Advanced breast cancer	6	6,288	95.4 (44.8–207.7)	7	7,388	94.7 (46.8–195.2)	1.0 (0.3–3.5)
Early breast cancer	15	6,288	238.5 (145.8–207.7)	6	7,388	81.2 (38.1–176.8)	2.9 (1.1–9.2)
All breast cancers	21	6,288	334.0 (219.3–510.5)	13	7,388	176.0 (103.6–300.9)	1.9 (0.9–4.1)
Years 1 and 2 follow‐up
Advanced breast cancer	6	11,510	52.1 (23.9,132.2)	9	12,932	69.6 (36.6,132.2)	0.7 (0.2,2.4)
Early breast cancer	17	11,510	147.7 (92.2,236.4)	9	12,932	69.6 (36.6,132.2)	2.1 (0.9,5.4)
All breast cancers	23	11,510	199.8 (133.2,299.7)	18	12,932	139.2 (88.1,219.9)	1.4 (0.7,2.8)