Marc Zimmerman

University of Michigan | U-M · Department of Health Behavior and Health Education

Background Firearm injuries are the leading cause of death for U.S. adolescents. Given the prevalence of firearm ownership in the U.S., particularly among parental figures in homes with children and teens, and the relationship between firearm access and injury outcomes, it is vital to shed light on potential parental motivations for keeping firearm...

Objectives. To examine whether, through interactions with preexisting socioeconomic status vulnerabilities, the COVID-19 pandemic exacerbated exposure to firearm violence among communities with a legacy of redlining (i.e., grading the creditworthiness of neighborhoods based on their sociodemographic composition). Methods. We used an exogenous popul...

Background Multiple anonymous reporting systems (ARS) have been implemented to prevent school violence and improve school climate. This study examines the facilitators and barriers to implementation and the role and usability of the Say Something Anonymous Reporting System (SS-ARS). Methods 10 qualitative interviews with key staff and administrato...

Background Firearm injuries are the leading cause of death for U.S. adolescents. Given the prevalence of firearm ownership in the U.S., particularly among parental figures in homes with children and teens, and the relationship between firearm access and injury outcomes, it is vital to shed light on potential parental motivations for keeping firearm...

BACKGROUND Youth violence, victimization, and bullying are pervasive in schools across the United States and are detrimental for learning and healthy development. K‐12 school safety is an increasingly urgent issue to research and understand from multiple perspectives. Physical and psychological safety in school is linked to better student and schoo...

Background: Although experiencing violence is a risk factor for substance use among youth, its association with same-day use of multiple substances (a form of polysubstance use) and mitigating factors is less well understood.Objectives: To identify whether prosocial factors modified the effect of experiencing violence on the frequency of same-day u...

Depressive symptoms and delinquent behaviors that emerge during adolescence pose both short- and long-term negative outcomes. Though there is growing evidence that exposure to teen dating violence is also associated with a greater likelihood of depressive symptoms and delinquent behaviors such as engaging in peer violence and substance use, less is...

Firearm-related injuries are a major public health concern in the USA. Given the increased racism endured by Asian Americans during the COVID-19 pandemic, the current study aims to investigate the direct and indirect effects of racism, mental distress, and substance use on firearm purchase among Asian Americans. To fulfill this purpose, we collecte...

Land banks across the United States are managing expanding vacant property inventories. By maintaining vacant properties and engaging residents in the process, land banks facilitate processes integral to building safe neighborhoods and may play a role in violence prevention. Using generalized additive mixed model regression, adjusted for spatial an...

Objective To study the interaction between violence exposure and motivations for firearm ownership in their associations with firearm storage among caregivers of teens in the United States. Methods In June–July 2020, we conducted a national survey of 2924 caregivers of US teens. We estimated multivariable logistic regressions among caregivers who...

Importance: Acute stroke treatment rates in the US lag behind those in other high-income nations. Objective: To assess whether a hospital emergency department (ED) and community intervention was associated with an increased proportion of patients with stroke receiving thrombolysis. Design, setting, and participants: This nonrandomized controll...

Firearm injuries are a leading cause of injury-related deaths in the U.S., but there is a dearth of federal funding for research on firearm injury prevention, compared to funding for research on other injuries and diseases. University research centers/institutes (C/Is) are in a position to help generate such research: they are multidisciplinary, ha...

Youth living in areas with high concentrations of vacant properties may be at particular risk for poor health outcomes given the associations between deteriorated vacant properties, poor mental health, and community violence. Vacant lot greening has emerged as a key strategy to mitigate the harms of deteriorated properties. Youth engagement in gree...

Background and objectives: Limiting firearm access is essential to decreasing teen suicide. Previous efforts have focused on household firearms; however, less is known about firearm access and possession among teens at increased suicide risk. Our objective was to estimate prevalence of firearm possession and access among high school-aged teens wit...

In response to fears regarding high-profiled school shootings and firearm violence, schools transformed dramatically, implementing school safety measures such as school police, armed security, metal detectors, and active shooter drills. This study used nationally representative data to assess the relationship between school safety policies and stud...

The association between witnessing firearm-involved violence and firearm carriage among teens, independent of non-firearm involved violence, has yet to be identified. The present analyses estimate associations of witnessing firearm-involved violence and non-firearm involved violence with firearm carriage in a nationally representative sample of tee...

Policy Points Firearm injury is a leading cause of death in the United States, with fatality rates increasing 34.9% over the past decade (2010‐2020). Firearm injury is preventable through multifaceted evidence‐based approaches. Reviewing past challenges and successes in the field of firearm injury prevention can highlight the future directions need...

Background: Factors related to risky drinking (e.g., motives, protective behavioral strategies [PBS]) may vary between youth who engage in polysubstance use compared to those who consume alcohol only. We examined differences in factors among youth who consume alcohol only compared to alcohol with other substances (i.e., polysubstance use), and cor...

Empowerment theory (Zimmerman, 2000) provides a framework for understanding and promoting positive youth development during adolescence. The current study considers reciprocal associations between psychological empowerment and adolescents' prosocial behavior, responsible decision making, social support giving, and delinquent behavior across the sch...

Researchers have documented that vacant lot greening can reduce community-level crime and violence. Busy Streets Theory (BST) suggests that residents who are involved in the greening process can help to improve physical environments and build social connections that deter crime and violence. Yet few researchers have explored how community engagemen...

Firearm possession increases the likelihood of hospital visits among adolescents and emerging adults. To better inform prevention practices, we examine data among adolescents and emerging adults (A/EAs; ages 16 to 29) presenting to an urban emergency department for any reason to understand the differences in firearm possession between males and fem...

Firearms are the leading cause of death for high-school age teens. To inform prevention efforts, we characterize the prevalence of healthcare provider (HCP) counseling of caregivers of teens around firearm safety, safety conversation elements, and caregiver receptivity towards counseling. A cross-sectional web survey (6/24/2020–7/22/2020) was condu...

We examined the effectiveness of the Say Something Anonymous Reporting System (SS-ARS) program in improving school safety in a cluster randomized control trial among over 700 students in 19 middle schools in the Miami-Dade County Public Schools. The SS-ARS is a program that emphasizes youth engagement and trains youth to recognize warning signs of...

We conducted a longitudinal observational study of 9873 micro-neighborhoods in a Midwestern city from 2015 to 2018 and estimated multilevel zero-inflated negative binomial models to evaluate if seasonal lawn maintenance of vacant properties was associated with a reduction in microneighborhoods’ annual summer maltreatment rates. We found a between-m...

Background As vacant lot inventories expand in cities across the U.S., vacant land management organizations require strategies that optimize their functioning while ensuring community benefit. Resident engagement in programs to green vacant land may be one helpful strategy. While resident engagement is often required for vacant land management orga...

Firearm injury is a significant public health concern among youth living in the United States. Youth with exposure to violence (ETV) are more susceptible to carrying and using a firearm. Few researchers, however, have examined psychological mechanisms undergirding the association between ETV and firearm aggression. Retaliatory attitudes have been d...

Firearm-related injury is a major public health concern in the U.S. Experience of racism and discrimination can increase the risk of minority group members engaging in or being victims of firearm-related violence. Given the increased racism endured by Asian Americans during the COVID-19 pandemic, it is imperative to understand firearm-related behav...

Impact statement: Anonymous reporting systems (ARS) have been used as a violence prevention strategy in schools by providing a means for individuals within a school community to safely and securely report information about potential violence or concerns about mental health, for example, through an anonymous hotline or reporting app. Despite widesp...

Youth violence remains a significant public health problem despite efforts to address it. We describe the evaluation results of Youth Empowerment Solutions (YES), an after-school active learning program implemented by trained local teachers and designed to engage middle school youth in multi-systematic promotive behaviors at the individual-, interp...

Limited research has been conducted on the state-level factors that may be associated with intentional school shootings. We obtained school shooting data from the Washington Post that identified any act of intentional interpersonal gunfire in a K-12 school over the course of two decades. We also compiled new data on active school shootings during t...

Electronic dating violence is a form of violence perpetrated through electronics between dating partners and is associated with worse mental health, greater risk of substance use, and increased risk of in-person forms of dating violence. Though prevalent and seeming to increase in occurrence across adolescence, little is known about trajectories of...

Racial discrimination jeopardizes a wide range of health behaviors for African Americans. Numerous studies demonstrate significant negative associations between racial discrimination and problematic alcohol use among African Americans. Culturally specific contexts (e.g., organized religious involvement) often function protectively against racial di...

The objective of this study was to assess parents’ firearm storage behaviors during the COVID-19 pandemic and characterize reasons why some parents made their firearms more accessible during this time. In June-July 2020, the study team conducted the FACTS National Survey—a cross-sectional, web-based, survey of 2,924 parents and their teens (ages14–...

Firearms are the leading cause of death among young adults. Given community violence is an important correlate of youth firearm carriage, we evaluated: 1) If the association between perceived community violence and firearm carriage is stronger when perceived police bias is greater; and 2) If this moderated association differs by race. Cross-section...

Globally, one in three women will experience intimate partner violence (IPV) within her lifetime. IPV attitudes are highly predictive of IPV. While a wealth of literature on risk factors related to IPV exist, an overarching critique in the field is the lack of studies examining risk factors across the socioecological framework. Using data from mult...

While much is known about attitudes towards police and weapon carriage independently, it is unclear whether the two are associated. In the current study, we explored this potential association and whether it was moderated by race in a sample of adolescents. After adjusting for age, gender, perceived risk of victimization, and violence victimization...

Unmaintained vacant land in urban areas is associated with a number of negative outcomes for residents of urban areas, including mental and physical health, safety, and quality of life. Community programs which promote land parcel maintenance in urban neighborhoods have been found to reverse some of the effects that unmaintained land has on nearby...

To describe and identify the correlates of firearm purchasing at the beginning of the COVID-19 pandemic among US families with teenagers. In June–July 2020, we conducted a national survey of 2924 parents and their teenagers in the US. We report results from this survey to describe firearm purchasing behaviors following the start of the COVID-19 pan...

Objective: Cannabis use is broadly associated with risky sexual behaviors, but evidence regarding how cannabis is related to condomless sex at the individual level is mixed. A better understanding of the context in which cannabis use is occurring, that is, why individuals are using cannabis on a particular day, could help clarify these relationshi...

Background aim: To examine racial/ethnic variations in the effect of parents' subjective neighborhood safety on children's cognitive performance. Methods: This cross-sectional study included 10,027 children from the Adolescent Brain Cognitive Development (ABCD) study. The exposure variable was parents' subjective neighborhood safety. The outcome...

Background: Recent studies have shown that parental educational attainment is associated with a larger superior temporal cortical surface area associated with higher reading ability in children. Simultaneously, the marginalization-related diminished returns (MDRs) framework suggests that, due to structural racism and social stratification, returns...

The main purpose of this article and this special section is to encourage greater attention to the key gaps that exist in our understanding of the epidemiology of adolescent firearm violence and to provide a pathway forward for future longitudinal research that will inform prevention efforts. This increased attention is especially salient given: (a...

Mental health issues among Chinese adolescents in boarding schools have attracted the attention of researchers in recent years. Our study was to examine the relationship between negative life events and depression experienced by Chinese adolescents at boarding schools, and to study whether peer support and active coping would moderate the relations...

Leveraging spatiotemporal variation in homicides that occurred during a 2.5-year weekly panel survey of 387 women ages 18–22 in Flint, Michigan, we investigate how young women's desires to become pregnant and to avoid pregnancy evolve in response to local homicides during the transition to adulthood. To address the endogeneity of exposure, we explo...

Purpose We investigate whether exposure to violence (ETV) during adolescence and emerging adulthood predicts engagement in chronic disease-related health risk behaviors years later among African Americans. Design A longitudinal study following youth from mid-adolescence (mean age = 14.8 years) to young adulthood (mean age = 32.0 years). Setting F...

This systematic review synthesizes research on school-based crisis intervention protocols, descriptions, and evaluations. We performed a comprehensive literature search, and 60 studies met the inclusion criteria for this review. We found an overwhelming lack of evaluation studies (n = 3), suggesting that interventions are being administered post-cr...

Adolescent exposure to violence (ETV) is associated with multiple negative health outcomes. Despite evidence linking adolescent ETV with later experiences of physical, sexual and psychological intimate partner violence (IPV) victimization, more longitudinal evidence is needed, and potential explanatory mechanisms should be tested. We examine data c...

Introduction Exposure to adverse experiences during adolescence may have significant implications for intimate partner violence during adulthood because it is during this developmental stage that many youth begin to have romantic relationships. Yet, few prospective longitudinal analyses on this topic exist. This study aims to fill a gap in the lite...

Background: Problematic smartphone usage has become a worldwide problem due to its high prevalence, rapid growth, and serious adverse consequences. Objective: The purpose of this study was to explore the mediating role of depressive symptoms in the relationship between stressful life events and problematic smartphone usage and the protective role o...

African Americans develop hypertension earlier in life than Whites and the racial/ethnic disparities in blood pressure level can appear as early as adolescence. Violence victimization, a prevalent environmental stressor among inner-city youth, may play a role in such disparities. In a sample of inner-city youth in the United States, the current stu...

Objectives: To evaluate motivations for firearm possession among urban young adults and determine if differences emerge between parents and non-parents, and to identify if storage practices differed according to motivation for firearm possession and parenting status. Methods: We used cross-sectional data among young adults seeking urban emergenc...

Objective This research examines the influence of adolescent family conflict on relationship quality in early and later emerging adulthood, while considering the interpersonal resources that protect youth against the intergenerational transmission of negative relationship quality. Background Family conflict during adolescence can impede the develo...

Purpose To describe the transition patterns into and out of post-traumatic stress (PTS) for youth and identify social supports preceding these transitions. Methods We used inhomogeneous, continuous-time, Markov Chain models to model transitions in and out of PTS using data from Waves 1, 3, 4, and 5 of the National Survey of Child and Adolescent We...

BACKGROUND African American young adults have low rates of uptake and engagement with health technologies, which may further widen sexual health inequalities. OBJECTIVE We examined factors influencing uptake and engagement for a consumer health informatics (CHI) intervention for HIV/STI prevention among African American young adults using the diff...

Background Regarding health technologies, African American young adults have low rates of uptake, ongoing usage, and engagement, which may widen sexual health inequalities. Objective We aimed to examine rates of uptake and ongoing usage, and factors influencing uptake, ongoing usage, and engagement for a consumer health informatics (CHI) intervent...

Researchers have shown that interpersonal and societal mattering have important implications for adolescent development. Yet, few researchers have focused on what predicts mattering, particularly societal mattering, and even fewer have studied mattering among rural youth. Thus, the purpose of this study is to explore how perceived contextual and re...

Introduction Exposure to violence is a risk factor for firearm carriage. Youth exposed to violence also have difficulty envisioning positive future outcomes (e.g., educational outcomes), which can increase the likelihood of firearm carriage over time. Researchers, however, have not yet examined whether changes in exposure to violence over time can...

Objective This study examined the association between baseline substance use and mental health, and non-partner violence trajectories among youth presenting to an urban emergency department who screened positive for drug use. Non-partner violence is physically violent victimization or aggression involving someone other than a dating partner. Metho...

Researchers have documented the negative associations between racial discrimination and alcohol use for young Black people, yet fewer researchers have examined these associations longitudinally and with racial identity as a protective factor. We use data from the Flint Adolescent Study (465 Black/African Americans) to investigate the relationship b...

Perceived racial discrimination (PRD) has been documented as a risk factor for worse psychological well-being among African Americans. Yet, most researchers have not examined how trajectories of PRD during emerging adulthood shape psychological well-being in adulthood. Moreover, less is known about whether demographic factors and components of raci...

Background: Recent research has documented marginalization-related diminished returns (MDRs) of socioeconomic status (SES), defined as weaker effects of SES indicators, such as parental educational attainment, on securing tangible outcomes for the members of socially marginalized (e.g., racial and ethnic minority) groups, compared to privileged so...

Introduction Youth who carry firearms—and peers that surround them—are at increased risk for violent injuries. Because firearm carriage behaviors can change over time within an individual, it is important to identify individual and social-contextual determinants that explain this within-person variability in carriage. Methods The authors identifie...

Statement-of-Purpose Firearm violence is a leading cause of U.S. mortality. Intensive longitudinal daily data studies [ILDDS] have not examined firearm carriage or same-day/next-day predictors of carriage or violent conflict. Such data are necessary to inform violence interventions. Methods/Approach ED youth/young adults (age=16–29) screening posi...

Background Youth educational outcomes are a function of a wide range of factors including parental education level. This effect, however, is shown to be smaller for African American, Hispanic, and Asian American youth, a pattern called Marginalization-related Diminished Returns (MDRs). It is, however, unknown if it is race/ethnicity or other condit...

Although childhood trauma exposure has a high incidence, traumatic stress often goes untreated in children and youth. We investigated peer relationship quality as a prevention strategy for reducing traumatic stress across different developmental periods. We analyzed longitudinal data from the National Survey of Child and Adolescent Wellbeing (NSCAW...

BACKGROUND The Michigan Model for Health™ (MMH) is the official health curriculum for the State of Michigan and prevailing policy and practice has encouraged its adoption. Delivering evidence‐based programs such as MMH with fidelity is essential to program effectiveness. Yet, most schools do meet state‐designated fidelity requirements for implement...

Within a lifetime, one in four women and more than one in 10 men will experience intimate partner violence (IPV). Researchers have begun to examine physical and social neighborhood risk factors of IPV, often using cross-sectional data. Most studies focus on risk or promotive factors. Often, neighborhood factors are studied through the lens of socia...

This study examines the effects of a neighbourhood greening and beautification strategy called Clean & Green on crime prevention and reduction. Point level data for all Part I index crimes and Clean & Green efforts in the study area from 2005 to 2014 are analysed using spatial and linear regression with two key modifications: (1) controlling for te...

Objective: To evaluate the feasibility and acceptability of a health promotion program to prevent school dropout and substance use among middle school-aged youth who display early warning signs of school disengagement. Intervention: Youth Empowerment Solutions for Positive Futures (YES-PF), an intensive, theoretically driven, 5-week summer enric...

Adapting evidence-based interventions (EBIs) guided by implementation science frameworks is a promising way to accelerate the translation of effective violence prevention in schools. School-based interventions offer an opportunity to reduce the risk of multiple forms of violence, including sexual violence (SV) and teen dating violence (TDV). EBIs i...

The debate about whether measurement reactivity exists in daily diary research on substance use is still unsettled due to the issues of study design and statistical methodology. This study proposes a time-varying effect model (TVEM) that characterizes the trajectory of substance use behaviors with nonparametric functions determined by the data rath...