2025
Target Trial Emulation of Severe Acute Respiratory Syndrome Coronavirus 2 Infection Versus No Infection and Risk of Post–Coronavirus Disease 2019 Conditions in the Omicron Variant Versus Prior Eras
Ioannou G, Berry K, Rajeevan N, Li Y, Yan L, Huang Y, Bui D, Hynes D, Rowneki M, Hickok A, Niederhausen M, Shahoumian T, Bohnert A, Boyko E, Korpak A, Fox A, Baraff A, Iwashyna T, Maciejewski M, Smith V, Berkowitz T, Pura J, Hebert P, Wong E, O’Hare A, Osborne T, Viglianti E, Aslan M, Bajema K. Target Trial Emulation of Severe Acute Respiratory Syndrome Coronavirus 2 Infection Versus No Infection and Risk of Post–Coronavirus Disease 2019 Conditions in the Omicron Variant Versus Prior Eras. Clinical Infectious Diseases 2025, ciaf087. PMID: 40208261, DOI: 10.1093/cid/ciaf087.Peer-Reviewed Original ResearchPost-COVID-19 conditionCumulative incidence of deathVeterans Health AdministrationMatched index dateCumulative incidence differenceExcess burdenCumulative incidenceBurden of mortalityHypothetical target trialIncidence of deathDeath up to 1 yearTarget trial emulationAll-Cause MortalityHealth recordsHealth AdministrationTrial emulationIncidence differencesIndex dateUninfected participantsPost-coronavirus diseaseVeteransUnvaccinated personsTarget trialsOmicron eraVaccination status
2024
Identifying Veterans Who Benefit From Nirmatrelvir-Ritonavir: A Target Trial Emulation
Yan L, Bui D, Li Y, Rajeevan N, Rowneki M, Berry K, Argraves S, Huang Y, Hynes D, Cunningham F, Huang G, Aslan M, Ioannou G, Bajema K. Identifying Veterans Who Benefit From Nirmatrelvir-Ritonavir: A Target Trial Emulation. Clinical Infectious Diseases 2024, 79: 643-651. PMID: 38864601, DOI: 10.1093/cid/ciae202.Peer-Reviewed Original ResearchRisk quartileVeterans Health AdministrationLowest risk quartileHighest risk quartileTarget trial emulationRisk prediction modelUntreated veteransRisk of deathOlder veteransYounger veteransHealth AdministrationTrial emulationMeasure IncidenceNirmatrelvir-ritonavirVeteransHospitalUntreated participantsCOVID-19QuartileRiskSevere coronavirus disease 2019ParticipantsPersonsCoronavirus disease 2019Severe COVID-19Regional variation in financial hardship among US veterans during the COVID-19 pandemic
Hauschildt K, Bui D, Govier D, Eaton T, Viglianti E, Ettman C, McCready H, Smith V, O’Hare A, Osborne T, Boyko E, Ioannou G, Maciejewski M, Bohnert A, Hynes D, Iwashyna T, Chai W, Bowling B, Maciejewski M, Womer J, Iwashyna T, Anderson S, Bernstein T, Cabrales A, Hauschildt K, Admon A, Byrd K, Cano J, Curtis J, DelMonico E, Horowitz D, Kamphius L, Korpela P, Kumbier K, Langa K, Prescott H, Rouse M, Saini S, Seelye S, Sussman J, Wawrin N, Monahan M, Bohnert A, Viglianti E, Akgun K, Aslan M, Cheung K, Li Y, Mutalik P, Rajeevan N, Yan L, Anderson L, Berkowitz T, Bogdan J, Bosworth H, Boucher N, Cummin G, Dennis P, Floyd B, Hastings S, Kaufman B, Meyer C, Miles A, Naylor J, Shepherd-Banigan M, Smith V, Smith B, Woods C, Dobalian A, Goetz M, Ikuta K, Ong M, Shaukat A, Backus L, Ferguson J, Osborne T, Shahoumian T, Veigulis Z, Zulman D, Bajema K, Bui D, Chen J, Govier D, Helfand M, Hickok A, Hough C, McCready H, Moss A, Newell S, Niederhausen M, Nugent S, Saha S, Slatore C, Takata Y, Teo A, Tuepker A, Vranas K, Winchell K, Hynes D, Boyko E, Au D, Baraff A, Berry Wyatt K, Borgerding J, Burwick N, Crothers K, Davis M, Doll J, Dominitz J, Eastment M, Fan V, Fox A, Hawkins E, Hebert P, Hu E, Korpak A, Morelli D, Peterson A, Reddy A, Shah J, Showalter W, Smith N, Suri P, Thomas E, Turner A, Vig E, Wicks K, Wong E, Wysham K, Ioannou G, O'Hare A, Jones B, Jones M, Knight S. Regional variation in financial hardship among US veterans during the COVID-19 pandemic. Health Affairs Scholar 2024, 2: qxae075. PMID: 38938272, PMCID: PMC11210296, DOI: 10.1093/haschl/qxae075.Peer-Reviewed Original Research
2023
Metformin prescription for U.S. veterans with prediabetes, 2010–2019
Gulanski B, Goulet J, Radhakrishnan K, Ko J, Li Y, Rajeevan N, Lee K, Heberer K, Lynch J, Streja E, Mutalik P, Cheung K, Concato J, Shih M, Lee J, Aslan M. Metformin prescription for U.S. veterans with prediabetes, 2010–2019. Journal Of Investigative Medicine 2023, 72: 139-150. PMID: 37668313, DOI: 10.1177/10815589231201141.Peer-Reviewed Original ResearchConceptsBody mass indexVeterans Health AdministrationIncident prediabetesHigh riskHealth AdministrationRetrospective observational cohort studyType 2 diabetes mellitusUse of metforminObservational cohort studyProportion of veteransMetformin prescribingGestational diabetesCohort studyMetformin prescriptionDiabetes mellitusDiabetes preventionMass indexCardiovascular diseaseMultivariable modelPrediabetesSubset of individualsMetforminU.S. veteransHealthcare systemVeterans
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