Age at entry (years) | HR | <17.5 | 17.5 to <20 | 20 to <25 | |||||
95% CI | P value | HR | 95% CI | P value | HR | 95% CI | P value | ||
Birth cohort | |||||||||
Overall | 1.12 | 1.06 to 1.18 | <0.001 | 1.30 | 1.23 to 1.38 | <0.001 | 1.37 | 1.27 to 1.80 | <0.001 |
1945–1949 | 1.16 | 0.99 to 1.36 | 0.061 | 1.28 | 1.10 to 1.48 | 0.001 | 1.49 | 1.25 to 1.79 | <0.001 |
1950–1954 | 1.14 | 1.00 to 1.30 | 0.052 | 1.44 | 1.27 to 1.64 | <0.001 | 1.50 | 1.26 to 1.78 | <0.001 |
1955–1959 | 1.02 | 0.91 to 1.15 | 0.707 | 1.23 | 1.06 to 1.42 | 0.006 | 1.41 | 1.16 to 1.73 | 0.001 |
1960–1964 | 1.17 | 1.03 to 1.32 | 0.015 | 1.23 | 1.05 to 1.43 | 0.009 | 0.97 | 0.75 to 1.23 | 0.777 |
1965–1969 | 0.85 | 0.69 to 1.05 | 0.140 | 0.99 | 0.84 to 1.17 | 0.915 | 1.31 | 1.11 to 1.56 | 0.001 |
1970–1974 | 1.14 | 0.94 to 1.39 | 0.196 | 1.42 | 1.22 to 1.66 | <0.001 | 1.06 | 0.81 to 1.38 | 0.671 |
1975–1979 | 1.93 | 1.48 to 2.52 | <0.001 | 1.51 | 1.17 to 1.93 | 0.001 | 1.81 | 1.40 to 2.32 | <0.001 |
1980–1984 | 1.67 | 1.33 to 2.09 | <0.001 | 1.42 | 1.12 to 1.81 | 0.003 | 1.37 | 0.93 to 2.02 | 0.109 |
1985–1995 | 1.10 | 0.71 to 1.71 | 0.670 | 1.55 | 1.10 to 1.21 | 0.012 | 1.15 | 0.68 to 1.94 | 0.594 |