Table 2:

Breast cancer incidence age-specific rate ratios for linear calendar trends during 1970–1979 and for 2005–2009 v. 1970–1979

Age, yr	Linear calendar trends 1970–1979		Population incidence for 2005–2009 v. 1970–1979 (reference)
	Invasive breast cancer		Invasive breast cancer		Ductal carcinoma in situ
	RR per year	95% CI	RR	95% CI	RR	95% CI
30–39	1.02	0.99–1.05	0.92	0.82–1.04	2.02	1.27–3.23
40–49	0.99	0.97–1.00	1.01	0.95–1.07	4.10	3.31–5.08
50–59	1.00	0.99–1.01	0.97	0.92–1.02	4.64	3.80–5.67
60–69	1.01	1.00–1.03	1.21	1.15–1.28	7.49	5.87–9.57
70–79	1.01	0.99–1.03	1.25	1.18–1.33	6.43	4.79–8.62
≥ 80	1.00	0.98–1.02	1.06	0.98–1.15	1.40	0.95–2.05

Note: CI = confidence interval, RR = rate ratio