Walter S. Mathis, MD
Associate Professor of PsychiatryCards
About
Research
Publications
2025
Prescriber Specialty Involvement in Medicare Patients With Chronic Hepatitis B
Ying X, Ng N, Reidy D, Azari J, Rosenblatt R, Mathis W, Congly S, Jesudian A. Prescriber Specialty Involvement in Medicare Patients With Chronic Hepatitis B. Journal Of Viral Hepatitis 2025, 32: e70070. PMID: 40922679, DOI: 10.1111/jvh.70070.Peer-Reviewed Original ResearchConceptsChronic hepatitis BCharacteristics of healthcare providersMedicare patientsRural-Urban Continuum CodesHepatitis BPhysician workforce shortagesLong-term antiviral treatmentChronic hepatitis B therapyMedicare Part D databaseNon-metropolitan countiesManagement of patientsLiver-related morbidityWorkforce shortagesAccessing CareHealthcare providersConsistent careContinuum CodesSpecialty involvementMetropolitan countiesAntiviral treatmentRural-urbanFollow-upMedicarePrescribingPatientsChanges in Local Community Spatial Trends of Motor Vehicle Accidents Near Cannabis Dispensaries after Recreational Cannabis Legalization
Weleff J, Golsorkhi M, Griffin M, Nia A, Mathis W. Changes in Local Community Spatial Trends of Motor Vehicle Accidents Near Cannabis Dispensaries after Recreational Cannabis Legalization. Cannabis And Cannabinoid Research 2025 PMID: 40779507, DOI: 10.1177/25785125251366791.Peer-Reviewed Original ResearchMotor vehicle accidentsRecreational cannabis legalizationDiscussion:Cannabis dispensariesRecreational cannabis dispensariesAccident rateCannabis legalizationResults:Interrupted time series analysisStatewide analysisDifference-in-differences analysisMixed-effects regression modelsNegative binomial mixed-effects modelMotor vehicle accident ratesNegative binomial regressionVehicle accident ratesImpact of recreational cannabis legalizationBinomial mixed-effects modelDispensary levelMethods:Crash dataBinomial regressionRoad safetyMixed-effects modelsVehicle accidentsGeographic access to community pharmacies based on walking, driving, and public transportation in the 10 most populated U.S. areas
Sharareh N, Tang S, Bress A, Mathis W, Berenbrok L, Hernandez I. Geographic access to community pharmacies based on walking, driving, and public transportation in the 10 most populated U.S. areas. Journal Of The American Pharmacists Association 2025, 65: 102479. PMID: 40684915, DOI: 10.1016/j.japh.2025.102479.Peer-Reviewed Original ResearchPublic transportTransport modesPrivate vehicle ownershipModes of transportPharmacy accessVehicle ownershipGeographic accessCommunity pharmaciesTravel timeMetropolitan areaDriving distanceStatistical areasGeographic information system analysisMicropolitan statistical areasDriving timeU.S. areasInformation system analysisTransportPharmacyLow rateSystem analysisAccessTravelU.S.InequalityHONE: A learning health system platform for advancing early intervention in first episode psychosis
Mathis W, Gibbs-Dean T, Cahill J, Srihari V. HONE: A learning health system platform for advancing early intervention in first episode psychosis. Schizophrenia Research 2025, 280: 1-9. PMID: 40209525, PMCID: PMC12052476, DOI: 10.1016/j.schres.2025.04.009.Peer-Reviewed Original ResearchConceptsLearning health systemEarly intervention servicesFirst-episode psychosisLearning health system frameworkQuality improvementDiverse healthcare settingsContinuous quality improvementMental health outcomesUser-centered designPatient-reported outcomesEvidence-based outcomesDiverse data sourcesCare deliveryEpisode psychosisImprove careKnowledge translationHealth outcomesHealth systemHealthcare settingsLifetime illnessHealthcare reformData visualizationUser engagementTransformation frameworkDuration of untreated psychosisError in Author Affiliation.
. Error in Author Affiliation. JAMA Netw Open 2025, 8: e2511341. PMID: 40232730, DOI: 10.1001/jamanetworkopen.2025.11341.Peer-Reviewed Original ResearchThe STEP Learning Collaborative: A statewide Learning Healthcare System (LHS) for first episode psychosis
Yoviene Sykes L, Levine N, Tayfur S, Gibbs-Dean T, Hazan H, Imetovski S, James J, Karmani S, Mathis W, Markovich P, Purushothaman D, Riley S, Tek C, Veillette C, Cahill J, Giard J, Marracino A, Barrette K, Bozak S, Gregory F, McDermott G, Srihari V. The STEP Learning Collaborative: A statewide Learning Healthcare System (LHS) for first episode psychosis. Schizophrenia Research 2025, 278: 96-108. PMID: 40132282, PMCID: PMC11981821, DOI: 10.1016/j.schres.2025.03.029.Peer-Reviewed Original ResearchConceptsLearning healthcare systemLearning CollaborativeHealthcare systemSchizophrenia spectrum disordersPopulation health outcomesLearning health systemSystems of careCare modelHigh-quality treatmentStage of illnessHealth outcomesHealth systemWorkforce developmentDuration of untreated psychosisStatewide systemEarly stages of illnessEarly psychosisWorkforce readinessStrengthening integrationPolicy advocacyLeverage informaticsCareEpisode psychosisStakeholder engagementUntreated psychosisVulnerability Index Approach to Identify Pharmacy Deserts and Keystone Pharmacies
Mathis W, Berenbrok L, Kahn P, Appolon G, Tang S, Hernandez I. Vulnerability Index Approach to Identify Pharmacy Deserts and Keystone Pharmacies. JAMA Network Open 2025, 8: e250715. PMID: 40080019, PMCID: PMC11907307, DOI: 10.1001/jamanetworkopen.2025.0715.Peer-Reviewed Original ResearchConceptsNational Council for Prescription Drug ProgramsPharmacy desertsSmall rural areasCross-sectional studyPharmacy accessCensus tractsPopulation-based cross-sectional studyRural areasLow-income areasHealth equityPrescription drug programPharmacy servicesMedication dispensingCommunity pharmaciesMain OutcomesTargeted policy interventionsPharmacy dataPrimary exposureSignificant disparitiesNearest pharmacyReimbursement ratesAt-riskPharmacyPublic healthPoint-of-care testingGeographic Disparities in Access to Gastroenterologists in the United States
Ying X, Yao L, Mathis W, Congly S, Jesudian A. Geographic Disparities in Access to Gastroenterologists in the United States. Gastroenterology 2025, 168: 1189-1191.e1. PMID: 39922544, DOI: 10.1053/j.gastro.2025.01.232.Peer-Reviewed Original Research
2024
The anomalous effect of COVID-19 pandemic restrictions on the duration of untreated psychosis
Nicholls-Mindlin J, Hazan H, Zhou B, Li F, Ferrara M, Levine N, Riley S, Karmani S, Mathis W, Keshavan M, Srihari V. The anomalous effect of COVID-19 pandemic restrictions on the duration of untreated psychosis. BJPsych Open 2024, 10: e216. PMID: 39628123, PMCID: PMC11698182, DOI: 10.1192/bjo.2024.813.Peer-Reviewed Original ResearchReflections on inductive thematic saturation as a potential metric for measuring the validity of an inductive thematic analysis with LLMs
De Paoli S, Mathis W. Reflections on inductive thematic saturation as a potential metric for measuring the validity of an inductive thematic analysis with LLMs. Quality & Quantity 2024, 59: 683-709. DOI: 10.1007/s11135-024-01950-6.Peer-Reviewed Original Research
News
News
- December 16, 2025
Srihari Guest Edits Special Issue of 'Schizophrenia Research'
- December 12, 2025
STEP Learning Collaborative: 2025 Statewide Impact & Year-End Review
- June 04, 2025
Dr. Michael J. Sernyak, Jr. You Made a Difference Awards Presented at CMHC
- April 11, 2025
A New Metric to Identify—and Prevent—Pharmacy Deserts