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Author

An-An Zhou

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Open access Sep 2026

Costs and healthcare resource utilization after COVID-19 hospitalization among US Medicare patients: a retrospective claims analysis.

AIMS The objective of this study was to quantify all-cause direct healthcare costs and healthcare resource utilization (HCRU) in the six months before and after COVID-19-associated hospitalization among Medicare fee-for-service (FFS) beneficiaries during the recent Omicron period (March 2023-March 2025). METHODS This...

A. Yehoshua, Rachel M. Black, An-An Zhou et al. · 0 citations
Review Open access Aug 2026

Social determinants of health, clinical outcomes, and healthcare resource utilization in participants with and without narcolepsy in the All of Us research program

Abstract Study Objectives Evaluate the clinical and economic burden and impact of social determinants of health (SDoH) in narcolepsy. Materials and Methods This retrospective, observational study used electronic health record and survey data from the All of Us Research Program (1/1/2009–7/31/2022). Participants with na...

S. Markt, C. Drachenberg, An-An Zhou et al. · 0 citations
Open access Aug 2026

2024-2025 BNT162b2 KP.2 COVID-19 full season vaccine effectiveness from vaccine registries linked to administrative claims in two states: A cohort study in non-immunocompromised adults.

BACKGROUND Data on effectiveness of COVID-19 vaccinations during the 2024-2025 respiratory season are limited, particularly among those with underlying medical conditions (UMC). We estimated BNT162b2 KP.2 vaccine effectiveness (VE) against COVID-19-associated hospital admission, emergency department (ED), and urgent ca...

Tara Ahi, K. Andersen, J. Mateus et al. · 0 citations
Jul 2026

KP.2-Adapted BNT162b2 COVID-19 Vaccine Uptake and Effectiveness in Children.

KP.2-adapted BNT162b2 COVID-19 vaccine provided significant protection against emergency department, urgent care, and inpatient encounters for COVID-19 in children.

K. Andersen, Tara Ahi, Maria D. McColgan et al. · 0 citations

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