The Potential of Minimum Wage Increases to Reduce Youth Homicide Disparities: Diminishing Returns for Black Youth.

We examine and compare the relationship between minimum wage increases and youth homicide rates in three groups: all youth, White youth only, and Black youth only. Using 2001-2019 mortality data from the National Vital Statistics System (NVSS) for all 50 states and Washington DC, we apply a difference in differences (DD) design to compare the change in youth homicides across states with varying changes in the state-specific minimum wage. With the inclusion of state-specific linear time trends, we find that a $1 increase in minimum wage leads to a significant 4% reduction (RR = 0.96, 95%CI [0.92, 0.99]) in homicides among White youth, but no significant reduction among Black youth (RR = 0.98, 95%CI [0.91, 1.04]). Findings are consistent with research on marginalization-related diminished returns for Black youth. While minimum wage increases are a promising step to reduce youth homicides overall, reducing homicide disparities experienced by Black youth requires additional components. Future research should examine policies with the specific intention to dismantle structural racism.

Medication Abortion "Reversal" Laws: How Unsound Science Paved the Way for Dangerous Abortion Policy.

Objectives. To longitudinally examine the legal landscape of laws requiring abortion patients be informed about the possibility of medication abortion (MAB) "reversal" (in quotes as it does not refer to an evidence-based medical procedure). Methods. We collected legal data on enacted state MAB-reversal laws across all 50 US states and Washington, DC, (collectively, states) from 2012 through 2021. We descriptively analyzed these laws to identify legal variation over time and geography, and conducted a content analysis to identify qualitative themes and patterns in MAB-reversal laws. Results. As of 2021, 14 states (27%)-mostly in the midwestern and southern United States-have enacted MAB-reversal laws. States largely use explicit language to describe reversal, require patients receive information during preabortion counseling, require physicians or physicians' agents to inform patients, instruct patients to contact a health care provider or visit "abortion pill reversal" resources for more information, and require reversal information be posted on state-managed Web sites. Conclusions. Reversal laws continue a dangerous precedent of using unsound science to justify laws regulating abortion access, intrude upon the patient‒provider relationship, and may negatively affect the emotional and physical health of patients seeking an MAB. (Am J Public Health. 2023;113(2):202-212. https://doi.org/10.2105/AJPH.2022.307140).

The Impact of Temporary Assistance for Needy Families Benefit Requirements and Sanctions on Maternal Material Hardship, Mental Health, and Parental Aggravation.

INTRODUCTION: Temporary Assistance for Needy Families requirements can be stress-inducing, difficult for families to complete, and may be detrimental during early life. We assessed the impact of TANF requirements on primary caregiving mothers' experiences of material hardship, anxiety, depression, and parental aggravation in the first year of a child's life. METHODS: Survey responses were selected from mothers in the Future of Families and Childhood Wellbeing Study, who received TANF in the first year of their child's life (N = 1085). RESULTS: Survey-weighted regression models showed associations between: presence of any requirements and increased material hardship, work requirements and increased material hardship, requirement to name the father of their child and increased depression, benefit cuts and increased parental aggravation, and benefit cuts and increased material hardship. DISCUSSION: Federal and state policies should revise requirement programs to increase program accessibility and support the mental health and financial stability of mothers applying for TANF to facilitate sustainable movement into employment.

Culturally Responsive Opioid and Other Drug Prevention for American Indian/Alaska Native People: a Comparison of Reservation- and Urban-Based Approaches.

There are few substance use treatment and prevention programs for AI/AN people that integrate culturally based practices with evidence-based treatment and prevention. The National Institutes of Health's (NIH's) Helping to End Addiction Long-term (HEAL) Prevention Cooperative supports two projects focused on AI/AN populations. One focuses on youth ages 15 to 20 years living within the Cherokee Nation reservation, a multicultural rural area in northeastern Oklahoma, and the second focuses on emerging adults ages 18 to 25 years living in diverse urban areas. We provide a brief overview of the two prevention trials and a case comparison across approaches using the framework of promising practices for intervention science with Indigenous communities (Whitesell et al., 2020) related to (1) integration of Indigenous and academic perspectives to respond to community needs, (2) community partnership and engagement, (3) alignment with Indigenous cultural values and practices, (4) capacity building and empowerment, (5) implementation within complex cultural contexts, and (6) tribal oversight. Overall, these two projects highlight the importance of long-standing relationships with community partners, engaging the community at all levels to ensure that programming is culturally and developmentally appropriate, and having tribal and elder oversight. These practices are key to establishing trust and building confidence in research in these communities and ensuring that research can benefit AI/AN people. These studies showcase how strong partnerships can advance health and support the conduct of rigorous science to help pinpoint optimal health solutions by identifying efficacious, culturally grounded intervention strategies. Although the sovereign status of tribes demands this type of partnership, this research serves as a model for all community research that has a goal of improving health.

Unemployment insurance program accessibility and suicide rates in the United States.

Unemployment is a risk factor for suicide. Unemployment insurance is the primary policy tool in the United States for alleviating the burden of unemployment on individuals. Our objective was to estimate the effect of state unemployment insurance accessibility on suicide rates, and effect modification by sociodemographic factors and unemployment rate. We used quarterly data from all 50 U.S. states and Washington, DC from 2000 to 2015, for a total of 3264 state-quarter units of analysis. The exposure was the quarterly unemployment insurance recipiency rate, i.e. the percentage of unemployed persons who received unemployment insurance. The outcome was the state-quarterly suicide rate per 100,000 population. Linear regression models included state, year, and calendar quarter fixed effects, state time trends, and state-level economic covariates to account for state-specific time-varying confounding. We assessed effect modification by the state-level unemployment rate, educational attainment, age, gender, and race. Based on fully adjusted models, potential protective effects of higher unemployment insurance recipiency rates appear to be small and restricted to demographic groups at higher risk of suicide including men, non-Hispanic White Americans, and those 45-64 years of age. These groups also generally have higher UI recipiency rates, therefore differences in subgroup estimates may reflect variations in eligibility policies and accessibility of UI programs.

Increasing adolescent girls' ability to identify STI-risk characteristics of sexual partners: a pilot study within an alternative disciplinary school.

OBJECTIVES: We evaluated the feasibility of conducting a 9-week long sexually transmitted infection (STI) prevention intervention, Angels in Action, within an alternative disciplinary school for adolescent girls. METHODS: All girls who were 16-18 years old, enrolled in the school and did not have plans to transfer from the school were eligible to participate. We measured process feasibility with recruitment, retention and participant enjoyment. Using a pretest-post-test design with a double post-test, we used χ² tests to estimate the intervention effect on participants' sexual partner risk knowledge, intentions to reduce partner risk and sexual activities in the past 60 days with three behavioural surveys: prior to, immediately following and 3 months after the intervention. RESULTS: Among the 20 girls who were eligible, 95% (19/20) of parents consented and all girls (19/19) agreed to participate. Survey participation was 100% (19/19) prior to, 76% (13/17) immediately following and 53% (9/17) 3 months after the intervention. The intervention was administered twice and a total 17 girls participated. Session attendance was high (89%) and most participants (80%) reported enjoying the intervention. The intervention increased the percentage of girls who could identify partner characteristics associated with increased STI risk: 38% before, 92% immediately following and 100% 3 months after the intervention (p=0.01). Girls also increased their intentions to find out four of the most highly associated partner characteristics (partner's age, recent sexual activity and STI or jail history): 32% before to 75% immediately following (p=0.02) and 67% 3 months after the intervention (p=0.09). CONCLUSIONS: This pilot study suggests girls at alternative disciplinary schools participated in and enjoyed a 9-week STI preventive intervention. Within alternative disciplinary schools, it is potentially feasible to increase girls' consideration of partner risk characteristics as a means to enhance their STI prevention skills.

Effects of Alcohol Interventions on Other Drug Use in the Cherokee Nation.

OBJECTIVES: To evaluate effects of 2 alcohol prevention interventions-Communities Mobilizing for Change on Alcohol (CMCA), a community organizing intervention designed to reduce youth alcohol access, and CONNECT, an individual-level screening and brief intervention approach-on other drug use outcomes. METHODS: We conducted a community intervention trial with quarterly surveys over 3 years (2012-2015) of high school students living within the jurisdictional service area of the Cherokee Nation in Oklahoma. We used generalized estimating equations and linear probability models to examine intervention spillover effects on other drug use. RESULTS: We found significant reductions in drug use other than alcohol attributable to CMCA and CONNECT. CMCA was associated with a 35% reduction in chewing tobacco use, a 39% reduction in marijuana use, and a 48% reduction in prescription drug misuse. CONNECT was associated with a 26% reduction in marijuana use and a 31% reduction in prescription drug misuse. CONCLUSIONS: Nonalcohol drug use was consistently reduced as a result of 2 theoretically and operationally distinct alcohol prevention strategies. Evaluations of alcohol prevention efforts should continue to include other drug use to understand the broader effects of such interventions.

State-level minimum wage and heart disease death rates in the United States, 1980-2015: A novel application of marginal structural modeling.

Despite substantial declines since the 1960's, heart disease remains the leading cause of death in the United States (US) and geographic disparities in heart disease mortality have grown. State-level socioeconomic factors might be important contributors to geographic differences in heart disease mortality. This study examined the association between state-level minimum wage increases above the federal minimum wage and heart disease death rates from 1980 to 2015 among 'working age' individuals aged 35-64 years in the US. Annual, inflation-adjusted state and federal minimum wage data were extracted from legal databases and annual state-level heart disease death rates were obtained from CDC Wonder. Although most minimum wage and health studies to date use conventional regression models, we employed marginal structural models to account for possible time-varying confounding. Quasi-experimental, marginal structural models accounting for state, year, and state × year fixed effects estimated the association between increases in the state-level minimum wage above the federal minimum wage and heart disease death rates. In models of 'working age' adults (35-64 years old), a $1 increase in the state-level minimum wage above the federal minimum wage was on average associated with ~6 fewer heart disease deaths per 100,000 (95% CI: -10.4, -1.99), or a state-level heart disease death rate that was 3.5% lower per year. In contrast, for older adults (65+ years old) a $1 increase was on average associated with a 1.1% lower state-level heart disease death rate per year (b = -28.9 per 100,000, 95% CI: -71.1, 13.3). State-level economic policies are important targets for population health research.

Comparing methods of misclassification correction for studies of adolescent alcohol use.

BACKGROUND: Despite concerns over measurement error, self-report continues to be the most common measure of adolescent alcohol use used by researchers. Objective measures of adolescent alcohol use continue to advance; however, they tend to be cost prohibitive for larger studies. By combining appropriate statistical techniques and validation subsamples, the benefits of objective alcohol measures can be made more accessible to a greater number of researchers. OBJECTIVES: To compare three easily implemented methods to correct for measurement error when objective measures of alcohol use are available for a subsample of participants, regression calibration, multiple imputation for measurement error (MIME), and probabilistic sensitivity analysis (PSA), and provide guidance regarding the use of each method in scenarios likely to occur in practice. METHODS: This simulation experiment compared the performance of each method across different sample sizes, both differential and non-differential error, and differing levels of sensitivity and specificity of the exposure measure. RESULTS: Failure to adjust for measurement error led to substantial bias across all simulated scenarios ranging from a 35% to 208% change in the log-odds. For non-differential misclassification, regression calibration reduced this bias to between a 1% and 23% change in the log-odds regardless of sample size. At higher sample sizes, MIME produced approximately unbiased (between a 0% and 9% change in the log-odds) and relatively efficient corrections for both non-differential and differential misclassification. PSA provided little utility for correcting misclassification due to the inefficiency of its estimates. CONCLUSION: Concern over measurement error resulting from self-reported adolescent alcohol use persists in research. Where appropriate, methods involving validity subsamples provide an efficient avenue for addressing these concerns.

25 Years of Complex Intervention Trials: Reflections on Lived and Scientific Experiences.

For the past 25 years, I have led multiple group-randomized trials, each focused on a specific underserved population of youth and each one evaluated health effects of complex interventions designed to prevent high-risk behaviors. I share my reflections on issues of intervention and research design, as well as how research results fostered my evolution toward addressing fundamental social determinants of health and well-being. Reflections related to intervention design emphasize the importance of careful consideration of theory of causes and theory of change, theoretical comprehensiveness versus fundamental determinants of population health, how high to reach, and health in all policies. Flowing from these intervention design issues are reflections on implications for research design, including the importance of matching the unit of intervention to the unit of assignment, the emerging field of public health law research, and consideration of design options and design elements beyond and in combination with random assignment.

Multilevel Prevention Trial of Alcohol Use Among American Indian and White High School Students in the Cherokee Nation.

OBJECTIVES: To evaluate the effectiveness of a multilevel intervention designed to prevent underage alcohol use among youths living in the Cherokee Nation. METHODS: We randomly assigned 6 communities to a control, Communities Mobilizing for Change on Alcohol (CMCA; a community-organizing intervention targeting alcohol access) only, CONNECT (a school-based universal screening and brief intervention) only, or a combined condition. We collected quarterly surveys 2012-2015 from students starting in 9th and 10th grades and ending in 11th and 12th grades. Response rates ranged from 83% to 90%; 46% of students were American Indian (of which 80% were Cherokee) and 46% were White only. RESULTS: Students exposed to CMCA, CONNECT, and both showed a significant reduction in the probability over time of 30-day alcohol use (25%, 22%, and 12% reduction, respectively) and heavy episodic drinking (24%, 19%, and 13% reduction) compared with students in the control condition, with variation in magnitude of effects over the 2.5-year intervention period. CONCLUSIONS: CMCA and CONNECT are effective interventions for reducing alcohol use among American Indian and other youths living in rural communities. Challenges remain for sustaining intervention effects.

The Effects of Perceived Racial/Ethnic Discrimination on Substance Use Among Youths Living in the Cherokee Nation.

We examined frequency and intensity of racial/ethnic discrimination and the longitudinal relationship to substance use. The sample included (N = 1,421) American Indian, American Indian and White, and White adolescents. A high frequency of perceived racial discrimination was associated with an increased risk for heavy alcohol use, prescription drug misuse, and other illicit drug use. Experiences of perceived racial discrimination high in intensity were associated with further increased risk of prescription drug misuse and other illicit drug use. Race/ethnicity did not moderate the relationship between perceived racial discrimination and substance use. Interventions targeting the deleterious effects of racial discrimination may need to be designed to account for both the environment and the individual.

Increased Partner Risk Characteristic Among Adolescents Using Alcohol In the Moment.

BACKGROUND: Alcohol is a recognized risk factor for sexually transmitted diseases acquisition, but the mechanism is unclear. Potentially, adolescents using alcohol in the 2 hours before sex (in-the-moment use) have riskier sexual partners. METHODS: We used multivariable logistic regression to examine the association between in-the-moment alcohol use and partner risk characteristics reported for the most recent sex among primarily 17- to 18-year-old adolescents originally recruited from a representative sample of Chicago public elementary schools. We created 3 composite partner risk profiles: partner familiarity risk (casual and unexpected), partner context risk (age discordance and met in public), and overall risk using all measures except partner alcohol use. RESULTS: Teens who reported any in-the-moment alcohol use were more likely than nondrinking teens to report casual (adjusted odds ratio [AOR], 3.2; 95% confidence interval [95% CI], 2.1-4.9), unexpected (AOR, 1.6; 95% CI, 1.0-2.5), age discordant (AOR, 3.0; 95% CI, 2.0-4.6), or met in public partners (AOR, 1.4; 95% CI, 1.0 to 2.1). For each composite measure, the number of partner risk characteristics reported increased linearly with the percent of teens drinking in the moment (Cochran-Armitage trend, P < 0.0001). Compared with zero characteristics, in-the-moment alcohol use was associated with increased odds of reporting 1 (AOR, 2.8; 95% CI, 1.7-4.5), 2 (AOR, 4.6; 95% CI, 2.7, 7.6), or 3 to 4 characteristics (AOR, 7.1; 95% CI, 3.3-15.3). CONCLUSIONS: Our findings expand the link between in-the-moment alcohol use and partner risk reported in prior studies to encompass adolescents' general sexual experiences and additional partner characteristics including the highly associated composite characteristics.

The Effect of an Increased Minimum Wage on Infant Mortality and Birth Weight.

OBJECTIVES: To investigate the effects of state minimum wage laws on low birth weight and infant mortality in the United States. METHODS: We estimated the effects of state-level minimum wage laws using a difference-in-differences approach on rates of low birth weight (< 2500 g) and postneonatal mortality (28-364 days) by state and month from 1980 through 2011. All models included state and year fixed effects as well as state-specific covariates. RESULTS: Across all models, a dollar increase in the minimum wage above the federal level was associated with a 1% to 2% decrease in low birth weight births and a 4% decrease in postneonatal mortality. CONCLUSIONS: If all states in 2014 had increased their minimum wages by 1 dollar, there would likely have been 2790 fewer low birth weight births and 518 fewer postneonatal deaths for the year.

Alcohol Sales to Youth: Data from Rural Communities Within the Cherokee Nation.

Access to alcohol among individuals under 21 years of age continues to be a public health concern with approximately 5000 youth deaths attributable to alcohol each year (US Department of Health and Human Services 2007). To date, there is no research on youth access to alcohol from commercial sources within rural communities with large populations of Native American families. We evaluated commercial access to alcohol by underage-appearing female confederates in 4 rural towns within the Cherokee Nation, a non-reservation tribal jurisdiction that includes a high proportion of Native Americans embedded within a predominately White population. Alcohol purchase attempts were conducted approximately every 4 weeks on 10 occasions for a total of 997 alcohol purchase attempts. In addition to purchase attempt outcome, we collected data on characteristics of the outlets and clerks. Alcohol was sold to confederates without use of age identification on 23 % of all purchase attempts. Across repeated attempts, 76 % of outlets sold alcohol to a confederate at least once. Males and younger clerks were more likely to sell alcohol to the confederates. Grocery stores and gas stations were more likely to sell alcohol to the confederate than liquor stores, but this effect was no longer significant once seller age was accounted for in a multivariable model. Three out of 4 outlets sold alcohol to young-appearing buyers at least once across repeated attempts. Results reinforce the continuing need for regular enforcement of laws against selling alcohol to minors.

The effects of survey modality on adolescents' responses to alcohol use items.

BACKGROUND: We examined differences in response to self-reported alcohol use items by survey mode, whether self-report differences were the result of modality effects or self-selection, and whether these differences varied across the treatment and control arms of a preventative intervention trial. METHODS: Data from an existing alcohol prevention trial were used to estimate the effect of survey modality on adolescent's self-reported alcohol use at ages 17 to 18. Estimates were derived from regression models controlling for self-reported alcohol use during 8th grade, measured using a single survey modality, as well as time invariant selection factors. RESULTS: No statistically significant survey modality effects were found. No differential effects of survey modality were observed by assigned intervention group. CONCLUSIONS: We provide initial evidence that adolescent alcohol prevention trials may use multiple survey modalities when necessary to increase response rates without harming interpretation of intervention effects.

Prevention trial in the Cherokee Nation: design of a randomized community trial.

Despite advances in prevention science and practice in recent decades, the U.S. continues to struggle with significant alcohol-related risks and consequences among youth, especially among vulnerable rural and Native American youth. The Prevention Trial in the Cherokee Nation is a partnership between prevention scientists and Cherokee Nation Behavioral Health to create, implement, and evaluate a new, integrated community-level intervention designed to prevent underage drinking and associated negative consequences among Native American and other youth living in rural high-risk underserved communities. The intervention builds directly on results of multiple previous trials of two conceptually distinct approaches. The first is an updated version of CMCA, an established community environmental change intervention, and the second is CONNECT, our newly developed population-wide intervention based on screening, brief intervention, and referral to treatment (SBIRT) research. CMCA direct-action community organizing is used to engage local citizens to address community norms and practices related to alcohol use and commercial and social access to alcohol among adolescents. The new CONNECT intervention expands traditional SBIRT to be implemented universally within schools. Six key research design elements optimize causal inference and experimental evaluation of intervention effects, including a controlled interrupted time-series design, purposive selection of towns, random assignment to study condition, nested cohorts as well as repeated cross-sectional observations, a factorial design crossing two conceptually distinct interventions, and multiple comparison groups. The purpose of this paper is to describe the strong partnership between prevention scientists and behavioral health leaders within the Cherokee Nation, and the intervention and research design of this new community trial.

The WHO Health Promoting School framework for improving the health and well-being of students and their academic achievement.

BACKGROUND: The World Health Organization's (WHO's) Health Promoting Schools (HPS) framework is an holistic, settings-based approach to promoting health and educational attainment in school. The effectiveness of this approach has not been previously rigorously reviewed. OBJECTIVES: To assess the effectiveness of the Health Promoting Schools (HPS) framework in improving the health and well-being of students and their academic achievement. SEARCH METHODS: We searched the following electronic databases in January 2011 and again in March and April 2013: Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, PsycINFO, CINAHL, Campbell Library, ASSIA, BiblioMap, CAB Abstracts, IBSS, Social Science Citation Index, Sociological Abstracts, TRoPHI, Global Health Database, SIGLE, Australian Education Index, British Education Index, Education Resources Information Centre, Database of Education Research, Dissertation Express, Index to Theses in Great Britain and Ireland, ClinicalTrials.gov, Current controlled trials, and WHO International Clinical Trials Registry Platform. We also searched relevant websites, handsearched reference lists, and used citation tracking to identify other relevant articles. SELECTION CRITERIA: We included cluster-randomised controlled trials where randomisation took place at the level of school, district or other geographical area. Participants were children and young people aged four to 18 years, attending schools or colleges. In this review, we define HPS interventions as comprising the following three elements: input to the curriculum; changes to the school's ethos or environment or both; and engagement with families or communities, or both. We compared this intervention against schools that implemented either no intervention or continued with their usual practice, or any programme that included just one or two of the above mentioned HPS elements. DATA COLLECTION AND ANALYSIS: At least two review authors identified relevant trials, extracted data, and assessed risk of bias in the trials. We grouped different types of interventions according to the health topic targeted or the approach used, or both. Where data permitted, we performed random-effects meta-analyses to provide a summary of results across studies. MAIN RESULTS: We included 67 eligible cluster trials, randomising 1443 schools or districts. This is made up of 1345 schools and 98 districts. The studies tackled a range of health issues: physical activity (4), nutrition (12), physical activity and nutrition combined (18), bullying (7), tobacco (5), alcohol (2), sexual health (2), violence (2), mental health (2), hand-washing (2), multiple risk behaviours (7), cycle-helmet use (1), eating disorders (1), sun protection (1), and oral health (1). The quality of evidence overall was low to moderate as determined by the GRADE approach. 'Risk of bias' assessments identified methodological limitations, including heavy reliance on self-reported data and high attrition rates for some studies. In addition, there was a lack of long-term follow-up data for most studies.We found positive effects for some interventions for: body mass index (BMI), physical activity, physical fitness, fruit and vegetable intake, tobacco use, and being bullied. Intervention effects were generally small but have the potential to produce public health benefits at the population level. We found little evidence of effectiveness for standardised body mass index (zBMI) and no evidence of effectiveness for fat intake, alcohol use, drug use, mental health, violence and bullying others; however, only a small number of studies focused on these latter outcomes. It was not possible to meta-analyse data on other health outcomes due to lack of data. Few studies provided details on adverse events or outcomes related to the interventions. In addition, few studies included any academic, attendance or school-related outcomes. We therefore cannot draw any clear conclusions as to the effectiveness of this approach for improving academic achievement. AUTHORS' CONCLUSIONS: The results of this review provide evidence for the effectiveness of some interventions based on the HPS framework for improving certain health outcomes but not others. More well-designed research is required to establish the effectiveness of this approach for other health topics and academic achievement.

Cross-gender social normative effects for violence in middle school: do girls carry a social multiplier effect for at-risk boys?

A social multiplier effect is a social interaction in which the behavior of a person in a social network varies with the normative behavior of others in the network, also known as an endogenous interaction. Policies and intervention efforts can harness social multiplier effects because, in theory, interventions on a subset of individuals will have "spillover effects" on other individuals in the network. This study investigates potential social multiplier effects for violence in middle schools, and whether there is evidence for a social multiplier effect transmitted from girls to boys. Three years of longitudinal data (2003-2005) from Project Northland Chicago were used to investigate this question, with a sample consisting of youth in Grades 6 through 8 in 61 Chicago Public Schools (N = 4,233 at Grade 6, N = 3,771 at Grade 7, and N = 3,793 at Grade 8). The sample was 49.3% female, and primarily African American (41.9%) and Latino/a (28.7%), with smaller proportions of whites (12.9%), Asians (5.2%) and other ethnicities. Results from two sets of regression models estimating the effects of 20th (low), 50th (average), and 80th (high) percentile scores for girls and boys on levels of violence in each gender group revealed evidence for social multiplier effects. Specifically, boys and girls were both influenced by social multiplier effects within their own gender group, and boys were also affected by normative violence scores among girls, typically those of the best-behaved (20th percentile) girls. The finding that girls may have positive social influence on boys' levels of violent behavior extends prior findings of beneficial social effects of girls on boys in the domains of education and risky driving. Further, this social normative effect presents a potential opportunity to improve school-based intervention efforts for reducing violence among youth by leveraging girls as carriers of a social multiplier effect for reduced violence in the middle school environmental context, particularly among boys, who are at greater risk.