Research

Research interests

Missing data, causal inference, longitudinal data analysis, long-term effects of COVID-19, gestational diabetes, clinical effectiveness of type 2 diabetes treatment.

• Statistical Methods
  • Thaweethai T, …, Haneuse S. Adjusting for Selection Bias Due to Missing Data in Electronic Health Records-Based Research by Blending Multiple Imputation and Inverse Probability Weighting. Stat Med. 2025 Jul;44(15-17):e70151. https://doi.org/10.1002/sim.70151

  • Reeder HT, Thaweethai T & Foulkes AS. Penalized regression with negative-unlabeled data: an approach to developing a Long COVID research index. BMC Med Res Methodol 26, 5 (2026). https://doi.org/10.1186/s12874-025-02737-5 

• Long COVID in children and adults
  • Thaweethai T, …, Horwitz L, Foulkes AS. Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection. JAMA. 2023 Jun 13;329(22):1934-1946. https://doi.org/10.1001/jama.2023.8823. (press: Washington Post, Los Angeles Times, PBS Newshour, NBC News, USA Today)
  • Gross RS and Thaweethai T (co-first), …, Foulkes AS, Stockwell MS. Characterizing Long COVID in Children and Adolescents. JAMA. 2024;332(14):1174–1188. https://doi.org/10.1001/jama.2024.12747 (press: US News)
  • Thaweethai T and Gross RS (co-first), …, Foulkes AS, Stockwell MS. Preventive effect of vaccination on long COVID in adolescents with SARS-CoV-2 infection. Vaccine. 2025 Oct 31;68:127907. doi: https://doi.org/10.1016/j.vaccine.2025.127907
  • Thaweethai T, …, Horwitz L, Foulkes AS, Levy, BD. Long COVID trajectories in the prospectively followed RECOVER-Adult US cohort. Nature Communications. 2025 Nov 17;16(1):9557. https://doi.org/10.1038/s41467-025-65239-4 (press: US News, HealthDay, Forbes, Harvard Gazette)
• Diabetes in pregnancy and maternal health
  • Thaweethai T, …, Florez JC, Powe CE. Distinct Insulin Physiology Trajectories in Euglycemic Pregnancy and Gestational Diabetes Mellitus. Diabetes Care. 2023 Dec 1;46(12):2137-2146. https://doi.org/10.2337/dc22-2226

  • Maya J, …, Thaweethai T, Powe CE. Gestational Weight Gain and Pregnancy Outcomes After GLP-1 Receptor Agonist Discontinuation. JAMA. 2025;334(24):2186–2196. https://doi.org/10.1001/jama.2025.20951 (press: Washington Post, US News, Medscape)

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