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Table 3 The incidence rate ratio (IRR) for each birth cohort of Chinese and Malay women, relative to the reference cohort (1926 – 1930), estimated from separate models for age < 50 and age ≥ 50 at diagnosis.

From: Ethnic differences in the time trend of female breast cancer incidence: Singapore, 1968 – 2002

  Age-cohort
Birth Cohort Age < 50* Age ≥ 50*
  Chinese women Malay women Chinese women Malay women
  IRR (95% CI) IRR (95% CI) IRR (95% CI) IRR (95% CI)
1891–1895 - - 0.27 (0.15 – 0.46) 0.60 (0.08 – 4.45)
1896–1900 - - 0.44 (0.33 – 0.57) 0.22 (0.03 – 1.63)
1901–1905 - - 0.53 (0.44 – 0.63) 0.64 (0.29 – 1.41)
1906–1910 - - 0.55 (0.48 – 0.64) 0.47 (0.25 – 0.89)
1911–1915 - - 0.69 (0.61 – 0.77) 0.67 (0.43 – 1.04)
1916–1920 - - 0.77 (0.69 – 0.86) 0.90 (0.64 – 1.27)
1921–1925 0.78 (0.59 – 1.04) 1.14 (0.54 – 2.40) 0.83 (0.75 – 0.91) 1.08 (0.80 – 1.45)
1926–1930 1.00 1.00 1.00 1.00
1931–1935 1.19 (0.98 – 1.44) 1.48 (0.85 – 2.55) 1.21 (1.10 – 1.33) 1.09 (0.81 – 1.45)
1936–1940 1.75 (1.47 – 2.09) 1.71 (1.01 – 2.90) 1.62 (1.47 – 1.79) 1.52 (1.13 – 2.04)
1941–1945 1.96 (1.65 – 2.32) 1.71 (1.06 – 3.01) 2.10 (1.90 – 2.33) 1.74 (1.25 – 2.42)
1946–1950 2.55 (2.17 – 3.00) 3.50 (2.16 – 5.65) 2.82 (2.51 – 3.17) 2.52 (1.76 – 3.60)
1951–1955 2.76 (2.35 – 3.24) 4.04 (2.53 – 6.46) - -
1956–1960 3.09 (2.61 – 3.65) 4.20 (2.58 – 6.83) - -
1961–1965 3.26 (2.70 – 3.93) 4.60 (2.74 – 7.72) - -
1966–1970 3.31 (2.60 – 4.21) 5.84 (3.21 – 10.60) - -
1971–1975 3.03 (1.96 – 4.67) 7.15 (2.85 – 17.93)   
  1. *Empty cells are due to the absence of women diagnosed with breast cancer in the respective birth cohorts.