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Table 2 Estimated rate ratios and 95 % confidence intervals for the cohort effects on motorcycle mortality rate per 100,000 people in the United States, 1975–2014

From: Mortality from motorcycle crashes: the baby-boomer cohort effect

Birth cohort Rate ratio 95 % Confidence interval
1895–1899 0.66 0.29, 1.50
1900–1904 0.95 0.51, 1.75
1905–1909 0.97 0.58, 1.64
1910–1914 0.69 0.43, 1.11
1915–1919 0.91 0.59, 1.42
1920–1924 0.92 0.60, 1.39
1925–1929 0.78 0.53, 1.17
1930–1934 1.00 Reference
1935–1939 1.15 0.78, 1.69
1940–1944 1.27 0.86, 1.87
1945–1949 1.43 0.97, 2.10
1950–1954 1.47 1.00, 2.16
1955–1959 1.48* 1.01, 2.18
1960–1964 1.47* 1.00, 2.17
1965–1969 1.17 0.79, 1.75
1970–1974 0.96 0.63, 1.46
1975–1979 0.69 0.45, 1.08
1980–1984 0.46* 0.29, 0.74
1985–1989 0.39* 0.23, 0.65
1990–1994 0.28* 0.15, 0.51
1995–1999 0.17* 0.07, 0.38
  1. * = P < 0.05