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Table 3 Estimated rate ratios and 95 % confidence intervals by gender for the cohort effects on motorcycle mortality rate per 100,000 United States, 1975–2014

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

  Males Females
Birth cohort Rate ratio 95 % CIa Rate ratio 95 % CIa
1895–1899 0.67 0.30, 1.49 1.24 0.37, 4.17
1900–1904 0.95 0.53, 1.72 1.46 0.59, 3.61
1905–1909 1.01 0.61, 1.69 0.39* 0.18, 0.85
1910–1914 0.69 0.43, 1.09 0.78 0.39, 1.57
1915–1919 0.90 0.59, 1.38 1.11 0.58, 2.12
1920–1924 0.91 0.61, 1.36 0.93 0.50, 1.73
1925–1929 0.77 0.52, 1.14 1.14 0.63, 2.06
1930–1934 1.00 Reference 1.00 Reference
1935–1939 1.14 0.78, 1.65 1.54 0.87, 2.72
1940–1944 1.27 0.87, 1.85 1.54 0.87, 2.72
1945–1949 1.44 0.99, 2.10 1.61 0.91, 2.85
1950–1954 1.49* 1.03, 2.17 1.65 0.93, 2.92
1955–1959 1.49* 1.02, 2.16 1.91* 1.08, 3.38
1960–1964 1.48* 1.02, 2.15 1.94* 1.10, 3.44
1965–1969 1.18 0.80, 1.74 1.53 0.85, 2.76
1970–1974 0.98 0.66, 1.47 1.03 0.56, 1.91
1975–1979 0.73 0.47, 1.11 0.63 0.33, 1.22
1980–1984 0.49* 0.31, 0.77 0.44* 0.22, 0.88
1985–1989 0.41* 0.25, 0.68 0.31* 0.14, 0.67
1990–1994 0.29* 0.16, 0.52 0.28* 0.11, 0.68
1995–1999 0.18* 0.08, 0.39 0.14* 0.04, 0.48
  1. * = P value < 0.05
  2. aCI, Confidence Interval