Table 5

Lifetime prevalence (%) of marijuana use in the study controls (no. of users/total) and the United States population, 12 years and older, from 1991 to 1993, by birth cohorta

Birth cohortMalesFemales
Controls Users/TotalControls (%)US Pop.a (%)Controls Users/TotalControls (%)US Pop.a (%)
<19302/414.91.00/290.00.0
1930–402/405.04.01/128.31.0
1941–453/933.311.00/40.02.0
1946–503/933.328.02/825.014.0
1951–550/50.050.00/20.030.0
1956–601/425.059.00/20.047.0
1961–700/30.057.6b3/837.548.6b
Total11/1119.910.9c6/659.210.4c
  • a Source: Johnson R. A. and D. R. Gerstein. Initiation of use of alcohol, cigarettes, marijuana, cocaine, and other substances in US birth cohorts since 1919. Am. J. Pub. Health, 88: 27–33, 1998. US Pop., United States population.

  • b Weighted average of the prevalence for 1961–1964 and 1965–1970.

  • c Percentage of users in the United States population standardized to the birth-cohort distribution of the controls in each gender.