Table 2.

Random-effects meta-analysis pooled gender ratios for prevalence of any cannabis use within 5-year birth cohorts

Birth cohort	n of individual gender ratio estimates	n of citationsa	n of countries	Random-effects pooled gender ratio [95% CI]
1941–1945	16	5	2	2.0 [1.8, 2.3]
1946–1950	24	6	3	2.0 [1.8, 2.3]
1951–1955	29	6	3	1.9 [1.7, 2.2]
1956–1960	32	8	3	1.9 [1.7, 2.1]
1961–1965	35	9	4	1.8 [1.6, 1.9]
1966–1970	35	10	5	1.7 [1.5, 1.8]
1971–1975	38	14	9	1.6 [1.5, 1.8]
1976–1980	33	12	7	1.4 [1.3, 1.5]
1981–1985	28	13	9	1.3 [1.2, 1.4]
1986–1990	43	8	29	1.3 [1.2, 1.4]
1991–1995	35	6	28	1.3 [1.2, 1.4]

Notes: CI = confidence interval.

^aRepresents the number of citations from which the individual estimates were extracted. Some citations reported results from separate repeated cross-sectional surveys, or separate surveys conducted in a number of different countries.