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Introduction to Volume II
Overview of Key Findings
Study Design and Procedures
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15 Years modal 1991 is approximately 22 year olds 30-day prevalence adjusted for inconsistency Adults in Modal Age Group NOTE alcohol amphetamines annual prevalence rates Approx barbiturates butyl nitrites cigarette smoking cocaine cohort effect crack crack cocaine Crystal Methamphetamine daily marijuana decline doctor's orders dropped drug was asked eighth and tenth eighth grade Entries are percentages estimates were adjusted five questionnaire forms Full-Time College Groups of 18 hallucinogens heroin high school seniors higher illicit drug inconsistency in self-reports inhalants Lifetime prevalence estimates MDMA methaqualone Modal Age Groups noncollege occasions of heavy older age groups once or twice opiates past high school population density Prevalence Among Young recent regions Respondents of Modal self-reports of drug sex differences six questionnaire forms strata Table text for discussion Thirty-Day Prevalence Total tranquilizers trend data trend estimates Trends in Annual Trends in Thirty-Day Types of Drugs young adults