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

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