Table 2.

IRRs for colon and rectal cancers, by birth cohort

Colon cancer, 1985–2014Rectal cancer, 1985–2014
CohortIRR (95% CI)CohortIRR (95% CI)
1898–19021.06 (1–1.13)1898–19021.26 (1.13–1.4)
1903–19071.08 (1.03–1.13)1903–19071.12 (1.04–1.2)
1908–19121.06 (1.03–1.1)1908–19121.08 (1.02–1.14)
1913–19171.09 (1.05–1.12)1913–19171.05 (1–1.1)
1918–19221.09 (1.06–1.13)1918–19221.06 (1.02–1.1)
1923–19271.17 (1.13–1.2)1923–19271.07 (1.04–1.11)
1928–19321.21 (1.18–1.25)1928–19321.08 (1.04–1.12)
1933–19371.21 (1.18–1.24)1933–19371.09 (1.05–1.12)
1938–19421.17 (1.14–1.2)1938–19421.09 (1.05–1.12)
1943–19471 (1–1)1943–19471 (1–1)
1948–19520.93 (0.9–0.96)1948–19521.02 (0.99–1.06)
1953–19570.86 (0.83–0.9)1953–19571.02 (0.97–1.06)
1958–19620.84 (0.8–0.88)1958–19621.06 (1–1.12)
1963–19670.91 (0.86–0.96)1963–19671.24 (1.16–1.34)
1968–19720.96 (0.89–1.04)1968–19721.43 (1.29–1.58)
1973–19771.15 (1.04–1.28)1973–19771.83 (1.59–2.09)
1978–19821.55 (1.35–1.77)1978–19822.43 (2.01–2.95)
1983–19872.34 (1.98–2.77)1983–19874.42 (3.36–5.82)
1988–19923.03 (2.37–3.88)1988–19923.95 (2.32–6.73)