Ellicott C. Matthay
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View article: Characteristics and Trends in Child Cannabis Exposures During Legalization in California
Characteristics and Trends in Child Cannabis Exposures During Legalization in California Open
After cannabis legalization in California, reports of child cannabis exposures requiring medical attention increased significantly. Most reported cannabis exposures occurred in the home through the ingestion of edible products, often packa…
View article: Stemming the Tide of the US Overdose Crisis: How Can We Leverage the Power of Data Science and Artificial Intelligence?
Stemming the Tide of the US Overdose Crisis: How Can We Leverage the Power of Data Science and Artificial Intelligence? Open
Policy Points We can leverage data science and artificial intelligence to inform state and local resource allocation for overdose prevention. Data science and artificial intelligence can help us answer four questions: (1) What is the impac…
View article: Integrating Artificial Intelligence into Causal Research in Epidemiology
Integrating Artificial Intelligence into Causal Research in Epidemiology Open
View article: Assessing Links Between Alcohol Exposure and Firearm Violence: A Scoping Review Update
Assessing Links Between Alcohol Exposure and Firearm Violence: A Scoping Review Update Open
Findings from this scoping review continue to support a causal relationship between alcohol exposures and firearm violence that extends beyond acute alcohol use to include AUD and alcohol-related policies. Policies controlling the availabi…
View article: Examining the Interactive Associations of Cannabis and Alcohol Outlets With Self-harm Injuries in California: A Spatiotemporal Analysis
Examining the Interactive Associations of Cannabis and Alcohol Outlets With Self-harm Injuries in California: A Spatiotemporal Analysis Open
Background: Cannabis use and alcohol use are associated with self-harm injuries, but little research has assessed links between recreational cannabis outlet openings on rates of self-harm within communities or the interactions of cannabis …
View article: Modern sources of controls in case-control studies
Modern sources of controls in case-control studies Open
In 1992, Wacholder et al. developed a theoretical framework for case-control studies to minimize bias in control selection. They described 3 comparability principles (study base, deconfounding, and comparable accuracy) to reduce the potent…
View article: Interactive associations of cannabis and alcohol outlet densities with assault injuries in California: a spatiotemporal analysis
Interactive associations of cannabis and alcohol outlet densities with assault injuries in California: a spatiotemporal analysis Open
Recreational cannabis outlets may influence rates of interpersonal violence, but research has yielded inconsistent findings. Modification by alcohol outlet density may help explain inconsistencies. We estimated the impacts of recreational …
View article: Associations of Local Cannabis Control Policies With Harmful Cannabis Exposures Reported to the California Poison Control System
Associations of Local Cannabis Control Policies With Harmful Cannabis Exposures Reported to the California Poison Control System Open
Background: Cannabis exposures reported to the California Poison Control System increased following the initiation of recreational cannabis sales on 1 January 2018 (i.e., “commercialization”). We evaluated whether local cannabis control po…
View article: Application of causal inference methods in individual-participant data meta-analyses in medicine: addressing data handling and reporting gaps with new proposed reporting guidelines
Application of causal inference methods in individual-participant data meta-analyses in medicine: addressing data handling and reporting gaps with new proposed reporting guidelines Open
Observational data provide invaluable real-world information in medicine, but certain methodological considerations are required to derive causal estimates. In this systematic review, we evaluated the methodology and reporting quality of i…
View article: Transporting treatment effects from difference-in-differences studies
Transporting treatment effects from difference-in-differences studies Open
Difference-in-differences (DID) is a popular approach to identify the causal effects of treatments and policies in the presence of unmeasured confounding. DID identifies the sample average treatment effect in the treated (SATT). However, a…
View article: Application of Causal Inference Methods to Pooled Longitudinal Non- Randomized Studies: A Methodological Systematic Review
Application of Causal Inference Methods to Pooled Longitudinal Non- Randomized Studies: A Methodological Systematic Review Open
View article: Alignment in local approaches to alcohol and cannabis control policy: A case study of California cities and counties
Alignment in local approaches to alcohol and cannabis control policy: A case study of California cities and counties Open
View article: Testing for intersectional measurement invariance with the alignment method: Evaluation of the 8‐item patient health questionnaire
Testing for intersectional measurement invariance with the alignment method: Evaluation of the 8‐item patient health questionnaire Open
Objective To demonstrate the use of the alignment method to evaluate whether surveys function similarly (i.e., have evidence of measurement invariance) across culturally diverse intersectional groups. Intersectionality theory recognizes th…
View article: Invited Commentary: Concealed Carrying of Firearms, Public Policy, and Opportunities for Mitigating Harm
Invited Commentary: Concealed Carrying of Firearms, Public Policy, and Opportunities for Mitigating Harm Open
In the last 30 years, 25 US states have relaxed laws regulating the concealed carrying of firearms (concealed-carry weapons (CCW) laws). These changes may have substantial impacts on violent crime. In a recent study, Doucette et al. (Am J …
View article: A quantitative assessment of the frequency and magnitude of heterogeneous treatment effects in studies of the health effects of social policies
A quantitative assessment of the frequency and magnitude of heterogeneous treatment effects in studies of the health effects of social policies Open
View article: State Cannabis Legalization and Psychosis-Related Health Care Utilization
State Cannabis Legalization and Psychosis-Related Health Care Utilization Open
Importance Psychosis is a hypothesized consequence of cannabis use. Legalization of cannabis could therefore be associated with an increase in rates of health care utilization for psychosis. Objective To evaluate the association of state m…
View article: Commentary: Quantifying the impact of bias to inform quality assessments in systematic reviews: The case of perchloroethylene and Non-Hodgkin's lymphoma
Commentary: Quantifying the impact of bias to inform quality assessments in systematic reviews: The case of perchloroethylene and Non-Hodgkin's lymphoma Open
View article: Opportunities and challenges in using instrumental variables to study causal effects in nonrandomized stress and trauma research.
Opportunities and challenges in using instrumental variables to study causal effects in nonrandomized stress and trauma research. Open
IV approaches have strengths and weaknesses compared with confounder-control approaches. IVs offers a promising complementary study design to improve evidence about the causal effects of exposures on outcomes relevant to stress and trauma.…
View article: Equity in Coverage of Local Cannabis Control Policies in California, 2020‒2021
Equity in Coverage of Local Cannabis Control Policies in California, 2020‒2021 Open
Objectives. To assess whether cannabis control policies that may protect public health were adopted evenly across California localities with differing sociodemographic compositions. Methods. From November 2020 to January 2021, we measured …
View article: Using online crowdsourced data to measure the availability of cannabis home delivery: A pilot study
Using online crowdsourced data to measure the availability of cannabis home delivery: A pilot study Open
Webscraping crowdsourced websites could be a viable method for quantifying rapidly evolving availability of cannabis home delivery. However, key practical and conceptual challenges must be overcome to conduct a full-scale validation and de…
View article: Excess Mortality in California by Education During the COVID-19 Pandemic
Excess Mortality in California by Education During the COVID-19 Pandemic Open
View article: When Effects Cannot be Estimated: Redefining Estimands to Understand the Effects of Naloxone Access Laws
When Effects Cannot be Estimated: Redefining Estimands to Understand the Effects of Naloxone Access Laws Open
Violations of the positivity assumption (also called the common support condition) challenge health policy research and can result in significant bias, large variance, and invalid inference. We define positivity in the single- and multiple…
View article: A Spatiotemporal Analysis of the Association of California City and County Cannabis Policies with Cannabis Outlet Densities
A Spatiotemporal Analysis of the Association of California City and County Cannabis Policies with Cannabis Outlet Densities Open
Background: Cannabis outlets may affect health and health disparities. Local governments can regulate outlets, but little is known about the effectiveness of local policies in limiting outlet densities and discouraging disproportionate pla…
View article: Heterogeneous treatment effects in social policy studies: An assessment of contemporary articles in the health and social sciences
Heterogeneous treatment effects in social policy studies: An assessment of contemporary articles in the health and social sciences Open
View article: Occupation and Educational Attainment Characteristics Associated With COVID-19 Mortality by Race and Ethnicity in California
Occupation and Educational Attainment Characteristics Associated With COVID-19 Mortality by Race and Ethnicity in California Open
In this population-based cohort study of working-age California adults, occupational disadvantage was associated with excess COVID-19 mortality for Latinx men. For all racial and ethnic groups, excess risk associated with low-education, es…
View article: Causal Inference Challenges and New Directions for Epidemiologic Research on the Health Effects of Social Policies
Causal Inference Challenges and New Directions for Epidemiologic Research on the Health Effects of Social Policies Open
Purposeof Review Epidemiologic research on the health effects of social policies is growing rapidly because of the potentially large impact of these policies on population health and health equity. We describe key methodological challenges…
View article: Sociodemographic and geographic disparities in excess fatal drug overdoses during the COVID-19 pandemic in California: A population-based study
Sociodemographic and geographic disparities in excess fatal drug overdoses during the COVID-19 pandemic in California: A population-based study Open
View article: Systematic Review Reveals Lack of Causal Methodology Applied to Pooled Longitudinal Observational Infectious Disease Studies
Systematic Review Reveals Lack of Causal Methodology Applied to Pooled Longitudinal Observational Infectious Disease Studies Open
There are many approaches to causal inference which may help facilitate accurate inference in the presence of unmeasured and time-varying confounding. In observational ID studies leveraging pooled, longitudinal IPD, the absence of these ca…
View article: A descriptive analysis of 2020 California Occupational Safety and Health Administration covid-19-related complaints
A descriptive analysis of 2020 California Occupational Safety and Health Administration covid-19-related complaints Open
COVID-19 mortality has disproportionately affected specific occupations and industries. The Occupational Safety and Health Administration (OSHA) protects the health and safety of workers by setting and enforcing standards for working condi…
View article: A descriptive analysis of 2020 California Occupational Safety and Health Administration COVID-19-related complaints
A descriptive analysis of 2020 California Occupational Safety and Health Administration COVID-19-related complaints Open
COVID-19 mortality disproportionately affected specific occupations and industries. The Occupational Safety and Health Administration (OSHA) protects the health and safety of workers by setting and enforcing standards for working condition…