Table 1.

Incidence Rate Ratios (IRR) and 95% Confidence Intervals (CI) for the Period and Cohort Effects Adjusted for Age in Canada, 1985 to 2004

	Males	Females
Period
1985–1989	1.0	1.0
1990–1994	0.92 (0.90–0.95)	0.88 (0.85–0.91)
1995–1999	0.87 (0.84–0.89)	0.77 (0.74–0.79)
2000–2004	0.79 (0.77–0.81)	0.68 (0.66–0.71)
Birth cohort
2000–2004	0.21 (0.15–0.28)	0.15 (0.11–0.22)
1995–1999	0.30 (0.25–0.37)	0.25 (0.19–0.33)
1990–1994	0.41 (0.35–0.48)	0.31 (0.24–0.39)
1985–1989	0.48 (0.42–0.55)	0.40 (0.32–0.51)
1980–1984	0.49 (0.43–0.55)	0.45 (0.36–0.55)
1975–1979	0.54 (0.48–0.60)	0.52 (0.43–0.64)
1970–1974	0.72 (0.66–0.80)	0.64 (0.54–0.76)
1965–1969	0.83 (0.76–0.90)	0.67 (0.58–0.76)
1960–1964	0.88 (0.82–0.94)	0.76 (0.68–0.84)
1955–1959	1.01 (0.95–1.07)	0.87 (0.80–0.95)
1950–1954	1.0	1.0
1945–1949	1.09 (0.97–1.15)	1.10 (1.03–1.18)
1940–1944	1.21 (1.14–1.29)	1.37 (1.28–1.47)
1935–1939	1.28 (1.19–1.36)	1.68 (1.56–1.80)
1930–1934	1.41 (1.32–1.52)	1.99 (1.84–2.14)
1925–1929	1.58 (1.46–1.70)	2.29 (2.12–2.47)
1920–1924	1.65 (1.53–1.78)	2.60 (2.39–2.81)
1915–1919	1.79 (1.65–1.94)	2.87 (2.65–3.12)
1910–1914	1.91 (1.75–2.07)	3.06 (2.81–3.33)
1905–1909	1.90 (1.73–2.08)	3.16 (2.88–3.47)
Drift, IRR per 5 years	0.93 (0.92–0.93)	0.88 (0.87–0.89)