The current study demonstrates the application of an analytic approach for incorporating multiple time trends in order to examine the impact of cohort effects on individual trajectories of eight drugs of abuse. Parallel analysis of two independent, longitudinal studies of high-risk youth that span ages 10 to 40 across 23 birth cohorts between 1968…

This study assesses the changing lifestyles, values, and preferences of American youth on a continuing basis. Each year since 1975, at least 13,000 seniors have participated in the annual survey, which is conducted in some 130 high schools nationwide. Since 1991, the study's annual surveys also have included surveys of similar nationally…

Since the mid-1960s, when illicit drug use burgeoned in the normal youth population, substance use by American young people has proven to be a rapidly changing phenomenon. Smoking, drinking, and illicit drug use are leading causes of morbidity and mortality, both during adolescence as well as later in life. How vigorously the nation responds to…

Conducted as part of the Monitoring the Future project, this study used a cohort-sequential design to examine period, age, and cohort effects on substance use among American youth between the ages of 18 and 28 from the high school classes of 1976 to 1986. This manuscript supersedes Paper 14 in the series which reported on American youth from 18-24…

The period of major risk for initiation to cigarettes, alcohol, and marijuana is completed mostly by age 20, and to illicit drugs other than cocaine by age 21. Overall patterns are similar for both sexes, with men initiating all drugs (except prescribed psychoactives) at higher rates than women. (Author/GC)

A cohort of former New York State adolescents were reinterviewed nine years after an initial survey. Drug use predictions, it was found, can be based on age effects and prior types of drug use; marijuana use, for example, is necessary for progression to other illicit drugs. (KH)

Analyzes the variation in prevalence rates of various substances in terms of age, year, and class effects. Interprets data provided by the Monitoring the Future Project, an ongoing survey of nationally representative high school senior classes. (KH)

Using a cohort-sequential design, identifies period, age, and class effects influencing the use of 12 different classes of drugs, both licit and illicit, by American youth aged 18 to 28 who were surveyed annually between 1976 and 1986. (Author/BJV)