Population Health Research Brief Series

More Girls in the Classroom Improves Adolescent Mental Health

Monica Deza and Maria Zhu
What role does the school environment play in shaping adolescent mental health? This brief examines how the mix of boys and girls in a classroom affects student mental health and wellbeing. The authors find that classrooms with more girls have better mental health outcomes for both boys and girls. 
December 2, 2025

See related: United States

Adult ADHD is Linked to Higher Illicit Drug Use and Prescription Drug Misuse

Andrew S. London, Kevin M. Antshel, Joshua Grove, Iliya Gutin, and Shannon M. Monnat
This brief summarizes findings from a study that describes differences in lifetime and past-year use of 7 illicit drugs (marijuana, cocaine, crack cocaine, methamphetamine, heroin, fentanyl, and hallucinogens) and misuse of 4 categories of prescription medications (opioids, tranquilizers, sedatives, and stimulants) between U.S. adults ages 18-64 with and without ADHD in 2023. The authors find that adults with ADHD are 1.6 to 3.3 times more likely to report past-year illicit drug use or prescription drug misuse than those without ADHD.
October 14, 2025

See related: United States

Community-Based Food Program Limits in Reducing Older Adult Food Insecurity

Madonna Harrington Meyer and Colleen M. Heflin
Older adults who are grappling with food insecurity may enhance their food supply through community-based programs that provide free and subsidized food. But these programs can be complex, expensive, and may be difficult for older adults to use. This final brief in our older adult food insecurity series describes the limits of community-based food programs for older adults, including access, food quality, and transportation barriers. 
October 7, 2025

See related: United States

The Limits of SNAP in Addressing Older Adult Food Insecurity

Colleen M. Heflin and Madonna Harrington Meyer
This brief describes how SNAP is currently not well designed for older adults in three respects: (1) the high levels of administrative burden associated with eligibility, certification, and benefit-determination processes, (2) the low value of SNAP benefits compared with the high costs associated with redeeming them, and (3) the high levels of state variation in SNAP policies that produce substantially different conditions for SNAP depending on where one lives.
September 30, 2025

See related: Aging, Food Security, Nutrition, U.S. Health Policy, United States

Nonfinancial Factors Shape Food Insecurity Among U.S. Older Adults

Madonna Harrington Meyer and Colleen M. Heflin
Nonfinancial factors such as poor physical and mental health, lack of access to healthy food, and transportation challenges make it more difficult for older adults to obtain, prepare, and consume healthy food. Based on the book, Food for Thought: Understanding Older Adults Food Insecurity, this brief summarizes how nonfinancial factors function as both causes and consequences of food insecurity in old age. 
September 23, 2025

Budget Tradeoffs Shape Food Insecurity Among U.S. Older Adults

Madonna Harrington Meyer and Colleen M. Heflin
For low-income older adults, it may be difficult to meet basic needs on a fixed monthly income.  This brief summarizes how budget tradeoffs between food and other essential expenses—housing, utilities, medical care, transportation, and personal and cleaning supplies—shape food insecurity among older adults. 
September 16, 2025

See related: United States

How is Food Insecurity Measured in the US and What Share of Older Adults are Food Insecure?

Colleen M. Heflin and Madonna Harrington Meyer
Based on the book, Food for Thought: Understanding Older Adults Food Insecurity, this brief summarizes the limitations of food insecurity measurements, noting that existing measures do not account for barriers that are common among older adults, such as mobility, physical distance, and transportation barriers.
September 9, 2025

See related: United States

Is Health Insurance Related to Breastfeeding Duration?

Anna De La Paz
This data slice describes differences in breastfeeding duration by insurance type among females ages 15-49 in the U.S. from 2022-2023. Findings show that mothers with private insurance breastfeed longer than mothers with public insurance, such as Medicaid. 
August 19, 2025

See related: United States

Heart Attacks are on the Rise among Young and Middle-Aged Adults in the United States

Vicente Cuevas
Heart attacks are on the rise among young and middle-aged adults in the United States. This brief describes these increases, summarizes the role of behavioral, lifestyle, and societal factors, and provides recommendations for organizations, healthcare providers, and policymakers to combat the increase in early-onset heart disease.
April 22, 2025

See related: United States

Breast Cancer Diagnoses are Increasing among Racial and Ethnic Minority Women in the U.S.

Esther Oshaji
This data slice examines trends in breast cancer incidence rates among women by race and ethnicity in the U.S. from 2000 to 2021. The author finds that, while incidence rates remain highest among non-Hispanic White women, the largest increases in diagnoses have been among American Indian/Alaska Native Asian/Pacific Islander women.
March 25, 2025

See related: United States

Older Women in the U.S. Were Lonelier Than Men During the COVID-19 Pandemic

Qiyu Deng
This data slice uses data from the 2020 Health and Retirement Study to examine gender and age differences in loneliness among older adults (50+) in the U.S. during the first year of the pandemic. 
March 18, 2025

See related: United States

How Does the Earned Income Tax Credit (EITC) Impact Time Spent Assisting Adults?

Anna Wiersma Strauss
This brief summarizes findings from a study that examines the effect of the Earned Income Tax Credit (EITC) on unpaid caregiving for adults. The author finds that in response to more generous EITC benefits, younger recipients increase their time spent on paid work and maintain their time spent assisting adults, while older recipients maintain their time spent on paid work and increase their time spent assisting their parents.
March 11, 2025

See related: United States

Younger Grandparents Provide Less Support to their Grandchildren Now than in the Past

Hyeonji Cho
This data slice uses data from the 2002-2022 Health and Retirement Study to examine the changes in grandparent support to grandchildren by age group in the U.S.
March 4, 2025

See related: United States

Disability Measures Used in U.S. Federal Surveys Significantly Underreport Disability Status

Nastassia Vaitsiakhovich, Scott D. Landes, Jean P. Hall, and Bonnielin K. Swenor
U.S. federal surveys commonly use two question sets to measure disability: the American Community Survey (ACS-6) and the Washington Group Short Set (WG-SS). This data slice examines the percentage of disabled people captured by these two different survey sets. 
February 25, 2025

How Do Gender and Marital Status Impact High-Risk Polysubstance Use

Kira England and Alexander Chapman
This brief summarizes findings from a study that examined gender and marital status differences in high-risk polysubstance use among U.S. adults ages 18 and older. The authors find that polysubstance use is higher among men and marriage was more protective against polysubstance use for men than women. 
February 18, 2025

Increased Suicidality Risk among Adolescents with an Active-Duty Sibling or Parent in the U.S.

Andrew S. London and Kevin M. Antshel
This brief summarizes findings from a study that examined whether having a sibling and/or a parent on active duty in the U.S. military is associated with suicidality (i.e., thinking about death a lot, believing oneself is better off dead, thinking about suicide, planning suicide, and attempting suicide) among 12- to 17-year-old adolescent girls and boys in the United States. 
February 11, 2025

Behavioral Science-Based “Nudges” Could Increase Physical Activity among Adolescents with ADHD

Hannah Patnaik, Andrew S. London, and Kevin M. Antshel
This brief summarizes findings from a recently completed pilot study testing the efficacy of behavioral interventions aimed at encouraging daily physical activity (i.e., steps measured with an activity tracker) among adolescents with ADHD. 
February 4, 2025

Hospital Travel Times are Too Long in Rural Puerto Rico

Catherine García
This data slice shows the stark geographic inequities in travel times to the nearest hospitals in Puerto Rico and calls for urgent policy action to address disparities in hospital accessibility.
January 28, 2025

Do Schools Have the Capacity to Provide Free Meals to Every Student?

Michah W. Rothbart, Jeehee Han, and Zac Reeves
This brief summarizes the findings from a study that analyzed the effectiveness of Universal Free Meals and Breakfast in the Classroom at increasing student school breakfast and lunch participation in capacity-constrained schools. 
January 21, 2025

What Factors Influenced COVID-19 Vaccine Hesitancy? Evidence from Social Media

Huseyin Zeyd Koytak
This brief summarizes findings from a study that examined over 50 million tweets (later rebranded as X) from 2020 to 2022 to investigate the patterns, justifications, and socioeconomic roots of vaccine hesitancy in the United States. 
January 14, 2025

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