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How Smoking, Drugs, and Obesity Affect Education, Using Genes as Instruments
... This research is based on genetic and survey data collected as part of the National Longitudinal Study of Adolescent Health (Add Health). The study was initially designed to explore the health-related behavior of adolescents in grades 7 through 12, but it has been employed widely across disciplines and has made recent contributions in economics (Echenique, Fryer and Kaufman 2006, Echenique and Fryer 2007, Alcott, Karlan, Mobius, Rosenblat and Szeidl 2007, Norton and Han 2009). In the first wave of the Add Health study (1994) (1995) 80 high schools were selected from a sampling frame of 26,666 based on their size, school type, census region, level of urbanization, and percent of the population that was white. ...
We explore the influence of genetic variation on subjective well-being by employing a twin design and genetic association study. In a nationally-representative twin sample, we first show that about 33% of the variation in life satisfaction is explained by genetic variation. Although previous studies have shown that baseline happiness is significantly heritable, little research has considered molecular genetic associations with subjective well-being. We study the relationship between a functional polymorphism on the serotonin transporter gene (5-HTTLPR) and life satisfaction. We initially find that individuals with the longer, transcriptionally more efficient variant of this genotype report greater life satisfaction (n=2,545, p=0.012). However, our replication attempts on independent samples produce mixed results indicating that more work needs to be done to better understand the relationship between this genotype and subjective well-being. This work has implications for how economists think about the determinants of utility, and the extent to which exogenous shocks might affect individual well-being.
... This research is based on genetic and survey data collected as part of the National Longitudinal Study of Adolescent Health (Add Health). The study was designed to explore the health-related behavior of adolescents in grades 7 through 12, but it has been employed widely across disciplines and has made recent contributions in economics (Echenique, Fryer and Kaufman 2006, Echenique and Fryer 2007, Alcott, Karlan, Mobius, Rosenblat and Szeidl 2007, Norton and Han 2009). In the first wave of the Add Health study (1994) (1995) 80 high schools were selected from a sampling frame of 26,666. ...
Research on happiness has produced valuable insights into the sources of subjective well-being. A major finding from this literature is that people exhibit a 'baseline' happiness that shows persistent strength over time, and twin studies have shown that genes play a significant role in explaining the variance of baseline happiness between individuals. However, these studies have not identified which genes might be involved. This article presents evidence of a specific gene that predicts subjective well-being. Using data from the National Longitudinal Study of Adolescent Health, we show that individuals with a transcriptionally more efficient version of the serotonin transporter gene (5HTT) are significantly more likely to report higher levels of life satisfaction. Having one or two alleles of the more efficient type raises the average likelihood of being very satisfied with one's life by 8.5% and 17.3%, respectively. This result may help to explain the stable component of happiness and suggests that genetic association studies can help us to better understand individual heterogeneity in subjective well- being.
Economists have long realized the importance of credit markets and borrowing behavior for household finance and economics more generally. However, none of this previous work has explored the role of biological constraints. Here we present the first evidence of a specific gene that may influence borrowing behavior. Using data from the National Longitudinal Study of Adolescent Health, we show that individuals with a polymorphism of the MAOA gene that has lower transcriptional efficiency are significantly more likely to report having credit card debt. Having one or both MAOA alleles of the low efficiency type raises the average likelihood of having credit card debt by 7.8% and 15.9% respectively. About half of our population has one or both MAOA alleles of the low type. The results suggest that economists should integrate innate propensities into economic models and consider the welfare consequences of possible discrimination by lenders on the basis of genotype.
This paper examines the influence of health conditions on academic performance during adolescence. To account for the endogeneity of health outcomes and their interactions with risky behaviors we exploit natural variation within a set of genetic markers across individuals. We present strong evidence that these genetic markers serve as valid instruments with good statistical properties for ADHD, depression and obesity. They help to reveal a new dynamism from poor health to lower academic achievement with substantial heterogeneity in their impacts across genders. Our investigation further exposes the considerable challenges in identifying health impacts due to the prevalence of comorbid health conditions and endogenous health behaviors.
We examine the effect of maternal education on birth outcomes using Vital Statistics Natality data for 1970 to 1999. We also assess the importance of four channels through which maternal education may improve birth outcomes: use of prenatal care, smoking, marriage, and fertility. In an effort to account for the endogeneity of educational attainment, we use data about the availability of colleges in the woman's county in her seventeenth year as an instrument for maternal education. We find that higher maternal education improves infant health, as measured by birth weight and gestational age. It also increases the probability that a new mother is married, reduces parity, increases use of prenatal care, and reduces smoking, suggesting that these may be important pathways for the ultimate effect on health. Our results add to the growing body of literature which suggests that estimates of the returns to education which focus only on increases in wages understate the total return. © 2001 the President and Fellows of Harvard College and the Massachusetts Institute of Technology
Recent studies investigating the labor-market effects of illicit drug use have consistently found a positive relation between drug use and earnings. These analyses have, however, ignored the potential relationship between drug use and human-capital formation. This paper examines the effect of drug use during adolescence on formal educational attainment using a sample drawn from the National Longitudinal Survey Youth Cohort. The probability of drug use is estimated across racial groups according to three categories; use of any illicit drug, use including hard drugs, and use of only marijuana. Fitted values for the probability of drug use are calculated and entered into a regression framework to estimate the number of school years completed. The empirical results indicate that all three categories of drug use are associated with significant negative impacts on educational attainment after controlling for individual differences in personal endowments and socioeconomic characteristics. On average, adolescent drug use is found to reduce eventual educational attainment by about 1 year, ceteris paribus . These findings suggest that previous studies that focus only on the direct effects of drug use on earnings may reflect a statistical bias that leads to an overstatement of the positive effects of drug use on earnings.
Experimental studies of prevention programs often randomize clusters of individuals rather than individuals to treatment conditions. When the correlation among individuals within clusters is not accounted for in statistical analysis, the standard errors are biased, potentially resulting in misleading conclusions about the significance of treatment effects. This study demonstrates the generalized estimating equations (GEE) method, focusing specifically on the GEE-independent method, to control for within-cluster correlation in regression models with either continuous or binary outcomes. The GEE-independent method yields consistent and robust variance estimates. Data from project DARE, a youth substance abuse prevention program, are used for illustration.
This is the tenth update of the human obesity gene map, incorporating published results up to the end of October 2003 and continuing the previous format. Evidence from single-gene mutation obesity cases, Mendelian disorders exhibiting obesity as a clinical feature, quantitative trait loci (QTLs) from human genome-wide scans and animal crossbreeding experiments, and association and linkage studies with candidate genes and other markers is reviewed. Transgenic and knockout murine models relevant to obesity are also incorporated (N = 55). As of October 2003, 41 Mendelian syndromes relevant to human obesity have been mapped to a genomic region, and causal genes or strong candidates have been identified for most of these syndromes. QTLs reported from animal models currently number 183. There are 208 human QTLs for obesity phenotypes from genome-wide scans and candidate regions in targeted studies. A total of 35 genomic regions harbor QTLs replicated among two to five studies. Attempts to relate DNA sequence variation in specific genes to obesity phenotypes continue to grow, with 272 studies reporting positive associations with 90 candidate genes. Fifteen such candidate genes are supported by at least five positive studies. The obesity gene map shows putative loci on all chromosomes except Y. Overall, more than 430 genes, markers, and chromosomal regions have been associated or linked with human obesity phenotypes. The electronic version of the map with links to useful sites can be found at http://obesitygene.pbrc.edu.
In this paper we examine the relationship between marijuana use and human capital formation by examining performance on standardized tests among a nationally representative sample of youths from the National Education Longitudinal Survey. We find that much of the negative association between cross-sectional measures of marijuana use and cognitive ability appears to be attenuated by individual differences in school attachment and general deviance. However, difference-in-difference estimates examining changes in test scores across 10th and 12th grade reveal that marijuana use remains statistically associated with a 15% reduction in performance on standardized math tests.
In this paper we review the available summary measures for the magnitude of socio-economic inequalities in health. Measures which have been used differ in a number of important respects, including (1) the measurement of "relative" or "absolute" differences; (2) the measurement of an "effect" of lower socio-economic status, or of the "total impact" of socio-economic inequalities in-health upon the health status of the population; (3) simple versus sophisticated measurement techniques. Based on this analysis of summary measures which have previously been applied, eight different classes of summary measures can be distinguished. Because measures of "total impact" can be further subdivided on the basis of their underlying assumptions, we finally arrive at 12 types of summary measure. Each of these has its merits, and choice of a particular type of summary measure will depend partly on technical considerations, partly on one's perspective on socio-economic inequalities in health. In practice, it will often be useful to compare the results of several summary measures. These principles are illustrated with two examples: one on trends in the magnitude of inequalities in mortality by occupational class in Finland, and one on trends in the magnitude of inequalities in self-reported morbidity by level of education in the Netherlands.
This article examines the relationship between youthful drinking and educational attainment using data on same-sex siblings pairs from the 1979-90 panels of the National Longitudinal Survey of Youth. We consider different estimators that can be constructed using siblings data, including estimators that adopt key restrictions of the standard regression, family fixed effect, and instrumental variable approaches. We also consider the properties of these estimators under more general conditions and show that under very plausible assumptions the effect of drinking on schooling can be bounded. The study finds that estimates of the schooling consequences of youthful drinking are very sensitive to specification issues. The research concludes that the actual effects of youthful drinking on education are likely to be small.
The relationship between dropping out of high school and substance use was explored using the National Longitudinal Survey of Young Adults, a national longitudinal sample of young Americans aged 19-27 in 1984. Cross-sectional data indicated that high school dropouts were more involved with cigarettes and illicit drugs than were graduates and that those who obtained a graduate equivalency diploma were the most intensely involved. Event-history analysis indicates that, controlling for other important risk factors, prior use of cigarettes, marijuana, and other illicit drugs increases the propensity to drop out and that the earlier the initiation into drugs, the greater the probability of premature school leaving. Thus, preventing or at least delaying the initiation of drug use will reduce the incidence of dropping out from our nation's high schools.
While there is a well-established, large positive correlation between mental and physical health and education outcomes, establishing a causal link remains a substantial challenge. Building on findings from the biomedical literature, we exploit specific differences in the genetic code between siblings within the same family to estimate the causal impact of several poor health conditions on academic outcomes. We present evidence of large impacts of poor mental health on academic achievement. Further, our estimates suggest that family fixed effects estimators by themselves cannot fully account for the endogeneity of poor health. Finally, our sensitivity analysis suggests that these differences in specific portions of the genetic code have good statistical properties and that our results are robust to reasonable violations of the exclusion restriction assumption.
We employ the National Longitudinal Survey of Youth data to explore the effect of youthful drinking on years of schooling and on the likelihood of college graduation. Our instruments for youthful drinking include the state beer tax and the minimum purchase age. Reduced form equations are also estimated. Our results indicate that heavy drinking in high school reduces the average number of years of schooling completed following high school. Other things equal, students who spend their high school years in states with relatively high taxes and minimum age are more likely to graduate from college.
This article develops and estimates a model of wage determination that isolates the effects of alcohol use on wages as mediated through human capital accumulation. Although generally insignificant, estimation results suggest that moderate alcohol use while in school or working has a positive effect on the returns to education or experience, and therefore on human capital accumulation, but heavier drinking reduces this gain slightly. Based on these results, alcohol use does not appear to adversely affect returns to education or work experience and therefore has no negative effect on the efficiency of education or experience in forming human capital.
This study examines the effects of teen alcohol use and availability on educational attainment. We demonstrate that teens who faced a lower minimum legal drinking age (MLDA) were substantially more likely to drink. However, we find that changes in MLDA had small and statistically insignificant effects on educational attainment. Using matched cohorts from two data sets, we also report two-sample instrumental variables estimates of the effect of teen drinking on educational attainment. These estimates are smaller than the corresponding ordinary least squares estimates and statistically insignificant, indicating that teen drinking does not have an independent effect on educational attainment.
The effect of schooling on the odds that smokers quit smoking is estimated. Particular attention is given to the possible importance of unobservables in measuring the schooling effect. It is shown that schooling has a relatively substantial positive effect on the odds that men and women ages twenty-five and older quit smoking. Copyright 1995 by MIT Press.
A review of evidence indicates that experimentally induced changes in the activity of serotonin (5-hydroxytryptamine) systems are associated with pronounced changes in feeding behaviour. In general, treatments and procedures believed to lead to an increased availability of 5-HT in the synaptic cleft or which directly activate 5-HT receptors reduce food consumption, while procedures which either directly or indirectly decrease 5-HT receptor activation bring about the opposite effect. Interpretation of findings is hindered by methodological difficulties involved in the experimental manipulation of serotonin metabolism, by the lack of precise behavioural measures of feeding, and by the presence of large stores of serotonin outside the brain. However, available data favour the idea that serotonin systems play an inhibitory role in feeding, possibly in the mediation of satiety. This proposal has implications for further experimental investigations of the control of food intake, and for the aetiology and treatment of obesity.
This minireview deals with the possible roles of monoamines in feeding and feeding disorders. The introduction sketches the results of earlier studies with local drug injections and selective neurotoxins which provided pharmacological evidence that monoamines can influence food intake and body weight. A table summarizing this evidence is used to list monoamine changes that could underlie anorexia or hyperphagia. It is apparent that abnormalities in the monoamines, along with their cotransmitters, could cause many forms of feeding disorder. It is proposed as a working hypothesis that several varieties of hyperphagia leading to obesity have a common element. This common factor is a change in excitability of a lateral hypothalamic reinforcement system as manifested in self-stimulation at a stimulation-bound feeding site. Understanding this feeding reward-aversion system helps us understand hyperphagia and anorexia. The neurochemistry of reward and aversion involves the monoamines. This paper focuses on dopamine and serotonin. The data support the hypothesis that dopamine systems projecting to the nucleus accumbens and other forebrain areas from the mid-brain ventral tegmental area (VTA) are important for approach and positive reinforcement in ingestive behavior and self-stimulation. Serotonin is hypothesized to facilitate satiety and inhibition of feeding reward in the hypothalamus. The next section abstracts our recent experiments that measured pharmacological and physiological release of the monoamines in the hypothalamus and nucleus accumbens during ingestive behavior and self-stimulation. In vivo microdialysis in freely moving rats suggested the following: (1) Norepinephrine was released in the paraventricular nucleus during the active, feeding period of the circadian cycle. (2) The serotonin metabolite 5-HIAA also increased in the PVN at the same time if there was food to eat. (3) Amphetamine infused into the lateral hypothalamus (LH) by reverse dialysis increased synaptic dopamine, norepinephrine, and serotonin. (4) The anorectic drug d-fenfluramine increased synaptic serotonin in the LH and also increased the dopamine metabolite DOPAC, suggesting that serotonin and dopamine in the LH might contribute to fenfluramine-induced satiety. Local d-fenfluramine injection into the LH or local infusion by reverse dialysis again increased serotonin and decreased 5-HIAA and interfered with local dopamine metabolism as reflected in decreased DOPAC and HVA. (5) Tryptophan, a serotonin precursor, given systemically at an anorectic dose, increased extracellular serotonin in the LH, but this effect was only detectable in food-deprived rats. This was seemingly pH independent (between 5.8 and 8). The passage other cations through CFo is strictly suppressed (even at pH 8 and with 300 mM NaCl in the medium).(ABSTRACT TRUNCATED AT 400 WORDS)
The potential pathways by which alcoholism might affect income are examined using data on males from the New Haven site of the Epidemiologic Catchment Area (ECA) data set to illustrate important indirect, and direct, effects of alcoholism on income. The detrimental indirect effects occur through reduction of educational attainment and increased probability of divorce. Because both educational attainment and marriage positively influence income, the adverse impact of alcoholism on both of these variables translates into lower income for alcoholics. The implications should lead researchers to distinguish more carefully between the direct and indirect costs of this condition. Policy analysts also should explore the financial impact of early onset when they look at overall costs. Because this has often been underestimated, fewer resources are devoted to prevention and treatment of alcoholism than a considered awareness of the problem would indicate is warranted.
In this study we use data from the National Longitudinal Survey of Youth (NLSY) to estimate the relationship between high school graduation, and alcohol and marijuana use among high school students. We also estimate the demand determinants for each of these substances. Our results show that there are significant adverse effects of alcohol and marijuana use on high school graduation. In particular, increases in the incidence of frequent drinking, liquor and wine consumption, and frequent marijuana use, significantly reduce the probability of high school graduation. Our results also show that beer taxes, liquor prices and marijuana decriminalization have a significant impact on the demand for these substances. These findings have important policy implications. A ten percent increase in beer taxes, reduces alcohol consumption among high school students, which in turn raises the probability of high school graduation by about three percent. A 1 percent increase in liquor prices raises the probability of high school graduation by over 1 percent. Raising the minimum drinking age for liquor also reduces liquor and wine consumption, and thus, improves the probability of high school graduation. Although the relationship between marijuana decriminalization and marijuana use is not significant, decriminalization is found to reduce the probability of becoming a frequent drinker. This result suggests that marijuana use and frequent drinking are substitute activities. Illicit substance abuse reduces the rate of high school completion, reduces expected future earnings and creates potential health problems. Thus, high-school-based preventive programs which discourage alcohol consumption and marijuana use are highly recommended, in order to alleviate these problems.
In the present study the role of self-consistency and self-enhancement motivations in adolescent cigarette smoking was examined. Respondents were 1971 fifth through eighth graders. They were asked to provide information about the number of cigarettes they had smoked in their lifetime and to rate themselves and most smokers on nine dimensions tapping coolness, sociability and intelligence. The results revealed that similarity between the self-image and smoker stereotype increases with age. In addition, evidence for self-consistency motivations for smoking was obtained on all three traits and support for self-enhancement motivations emerged for the cool trait. Finally, it was found that self-consistency becomes increasingly important from fifth to eighth grade. This is the first empirical demonstration of developmental differences in the relation between the self-image, the smoker stereotype and smoking. The importance of the self-identification process in adolescent smoking is discussed.
Understanding of the genetic influences on obesity has increased at a tremendous rate in recent years. By some estimates,
40 to 70 percent of the variation in obesity-related phenotypes in humans is heritable. Although several single-gene mutations
have been shown to cause obesity in animal models, the situation in humans is considerably more complex. The most common forms
of human obesity arise from the interactions of multiple genes, environmental factors, and behavior, and this complex etiology
makes the search for obesity genes especially challenging. This article discusses the strategies currently being used to search
for human obesity genes and recent promising results from these efforts.
The prevalence of marijuana use among young people has risen rapidly in recent years, causing concern over the potential impact on academic performance of such use. While recent studies have examined the effect of alcohol use on educational attainment, they have largely ignored the potential negative effects of other substances, such as marijuana. This paper examines whether the relationship between the initiation of marijuana use and the decision to drop out of high school varies with the age of dropout or with multiple substance use. Data are from a longitudinal survey of 1392 adolescents aged 16-18 years. The results suggest that marijuana initiation is positively related to dropping out of high school. Although the magnitude and significance of this relationship varies with age of dropout and with other substances used, it is concluded that the effect of marijuana initiation on the probability of subsequent high school dropout is relatively stable, with marijuana users' odds of dropping out being about 2.3 times that of non-users. Implications of these conclusions are considered for both policy makers and researchers.
This paper uses data from the National Education Longitudinal Study to estimate the association between illicit drug use during high school and the number of years of schooling completed. The analysis accounts for the possibility that drug use is endogenous using two methods: (1) by controlling for individual-level characteristics measured before high school entrance; and (2) by using an instrumental variables method, with state drug policies and 8th grade school characteristics as identifying variables. Findings suggest that marijuana use and cocaine use in high school are associated with reductions in the number of years of schooling completed.
In this article we report a novel statistically significant association between the D4.7/D4.7 genotype of the DRD4 gene and the body mass of black and Hispanic participants in the National Longitudinal Study of Adolescent Health (Add Health). We investigated the role of the 48-bp repeat polymorphism of the dopamine receptor 4 gene (DRD4) in body mass regulation in 2,277 adolescents and young adults followed in 1995 (12-18 years old), 1996, and 2002 by Add Health. After the effects of age, sex, and ethnicity were adjusted, the D4.7/D4.7 genotype reduced the body mass index (BMI)-percentile score by 15 and 12.5, as compared to those with other genotypes, for African-Americans (P = 0.0047) and Hispanic-Americans (P = 0.037), respectively. Although the D4.7/D4.7 genotype was associated with a lower BMI-percentile score in white individuals compared to other genotypes, the difference was not significant. Individuals heterozygous for D4.7 did not differ from those with the other/other genotype.
This paper tests the hypothesis that education improves health and increases people's life expectancy. It does so by analyzing the effect of education on smoking behaviors. To account for the endogeneity of smoking, the analysis develops an instrumental variable approach which relies on the fact that during the Vietnam War college attendance provided a strategy to avoid the draft. The results indicate that education does affect smoking decisions: educated individuals are less likely to smoke, and among those who initiated smoking, they are more likely to have stopped.
We use the Vietnam war draft avoidance behavior documented by Card and Lemieux [Card, D., Lemieux, T., May 2001. Did draft avoidance raise college attendance during the Vietnam war? American Economic Review 91 (2), 97-102] as a quasi experiment to infer causation from education to smoking and find strong evidence that education, whether measured in years of completed schooling or in educational attainment categories, reduces the probability of smoking at the time of the interview, more particularly the probability of smoking regularly. However, while we find that more education substantially increases the probability of never smoking, our instrumental procedure yields imprecise estimates of the effect of education on smoking cessation. Potential mechanisms linking education and smoking are also explored.
Economists have argued that obesity may lead to worse labor market outcomes, especially for women. Empirical methods to test this hypothesis have not thus far adequately controlled for the endogeneity of obesity. We use variation in genotype to predict variation in phenotype (obesity). Genetic information from specific genes linked to obesity in the biomedical literature provides strong exogenous variation in the body mass index and thus can be used as instrumental variables. These genes predict swings in weight of between 5 and 20 pounds for persons between five and six feet tall. We use additional genetic information to control for omitted variables correlated with both obesity and labor market outcomes. We analyzed data from the third wave of the Add Health data set, when respondents are in their mid-twenties. Results from our preferred models show no effect of lagged obesity on the probability of employment or on wages, for either men or women. This paper shows the potential of using genetic information in social sciences.
This article measures the effects of college drinking on study hours, grade point average (GPA), and major choice using simultaneous equation models and data from the 1993 College Alcohol Study. Binging and intoxication decrease GPA directly and indirectly by reducing study hours. Greater frequency of drinking increases the effect on study hours but not the total effect on GPA. College drinking increases the probability of choosing a business major but decreases the probability of choosing engineering. Simulations show that the effects of heavy drinking on GPA and major choice reduce future weekly earnings by between 0.3 and 9.8%. Copyright 2002, Oxford University Press.
This article examines the relationship between youthful drinking and educational attainment using data on same-sex siblings pairs from the 1979-90 panels of the National Longitudinal Survey of Youth. We consider different estimators that can be constructed using siblings data, including estimators that adopt key restrictions of the standard regression, family fixed effect, and instrumental variable approaches. We also consider the properties of these estimators under more general conditions and show that under very plausible assumptions the effect of drinking on schooling can be bounded. The study finds that estimates of the schooling consequences of youthful drinking are very sensitive to specification issues. The research concludes that the actual effects of youthful drinking on education are likely to be small. Copyright 2001 by Oxford University Press.
This paper presents an exploratory analysis using NLSY97 data of the relationship between the likelihood of school continuation and the choices of whether to smoke or drink. We demonstrate that in the United States as of the late 1990s, smoking in 11th grade was a uniquely powerful predictor of whether the student finished high school, and if so whether the student matriculated in a four-year college. For economists the likely explanation for this empirical link would be based on interpersonal differences in time preference, but that account is called in question by our second finding -- that drinking does not predict school continuation. We speculate that the demand for tobacco by high school students is influenced by the signal conveyed by smoking (of being off track in school), one that is especially powerful for high-aptitude students. To further develop this view, we present estimates of the likelihood of smoking as a function of school commitment and other, more traditional variables. There are no direct implications from this analysis for whether smoking is in some sense a cause of school dropout. We offer some speculations on this matter in the conclusion.
Analysis of Prevention Program Effectiveness with Clustered Data Using Generalized Estimating Equations Genetic Information, Obesity, and Labor market outcomes Does marijuana use impair human capital formation
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Ecstasy use among American teens drops for the first time in recent years, and overall drug and alcohol use also decline in the year after 9/11. University of Michigan News and Information Services
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Johnston LD, O'Malley PM, Bachman JG. Ecstasy use among American teens drops for
the first time in recent years, and overall drug and alcohol use also decline in the
year after 9/11. University of Michigan News and Information Services: Ann
Arbor, MI, 16 December 2002 [On-line]. Available: www.monitoringthefuture.
org, accessed 9/30/03.
Ecstasy use among American teens drops for the first time in recent years, and overall drug and alcohol use also decline in the year after 9/11. University of Michigan News and Information Services
- L D Johnston
- P M O'malley
- J G Bachman
Johnston LD, O'Malley PM, Bachman JG. Ecstasy use among American teens drops for
the first time in recent years, and overall drug and alcohol use also decline in the
year after 9/11. University of Michigan News and Information Services: Ann
Arbor, MI, 16 December 2002 [On-line]. Available: www.monitoringthefuture.
org, accessed 9/30/03.