Addressing the Younger Age at Onset in Breast Cancer Patients in Asia: An Age-Period-Cohort Analysis of Fifty Years of Quality Data from the International Agency for Research on Cancer

Table 2

The magnitude of cohort effects for the two populations.

Year of birth	Rate ratio (95% confidence intervals)
	Asia	Europe
1865	**	0.33 (0.32, 0.35)
1870	0.06 (0.05, 0.08)	0.35 (0.33, 0.36)
1875	0.07 (0.06, 0.09)	0.36 (0.35, 0.37)
1880	0.08 (0.07, 0.10)	0.37 (0.36, 0.38)
1885	0.09 (0.08, 0.11)	0.38 (0.37, 0.40)
1890	0.11 (0.10, 0.12)	0.40 (0.39, 0.41)
1895	0.13 (0.12, 0.14)	0.41 (0.40, 0.42)
1900	0.15 (0.14, 0.16)	0.43 (0.42, 0.44)
1905	0.18 (0.17, 0.19)	0.45 (0.43, 0.46)
1910	0.22 (0.20, 0.23)	0.47 (0.46, 0.49)
1915	0.25 (0.24, 0.27)	0.51 (0.50, 0.53)
1920	0.28 (0.27, 0.30)	0.57 (0.55, 0.58)
1925	0.31 (0.29, 0.33)	0.64 (0.62, 0.65)
1930	0.36 (0.34, 0.38)	0.73 (0.71, 0.75)
1935	0.43 (0.41, 0.46)	0.83 (0.81, 0.86)
1940	0.54 (0.51, 0.57)	0.93 (0.90, 0.96)
1945	0.64 (0.61, 0.68)	1.00 (0.97, 1.03)
1950	0.73 (0.70, 0.77)	1.04 (1.02, 1.07)
1955	0.82 (0.78, 0.85)	1.06 (1.04, 1.08)
1960	0.88 (0.86, 0.91)	1.05 (1.04, 1.07)
1965	0.94 (0.93, 0.96)	1.03 (1.02, 1.04)
1970	1.00	1.0

∗∗No data for Asian population.