Research

PUBLICATIONS

1. Rong Fu, Dung Duc Le, Yoko Ibuka, "The impact of reducing formal care benefits on caregivers' well-being: evidence from Japan." Review of Economics of the Household, forthcoming.
2. Takayuki Ando, Yoko Ibuka, Rei Goto, Junji Haruta, Dung Duc Le, Seitaroh Fujishima, "Effect of influenza vaccine subsidies for older adults on vaccination coverage and mortality before and during the COVID-19 pandemic: an ecological study in Japan." Public Health, 2023, 224: 152-158. doi: 10.1016/j.puhe.2023.08.031.
  - Takayuki Ando, Yoko Ibuka, Rei Goto, Junji Haruta, Dung Duc Le, Seitaroh Fujishima, "Re: Letter to the editor of Public Health in response to "Effect of influenza vaccine subsidies for older adults on vaccination coverage and mortaltiy before and during the COVID-19 pandeimic: an ecological study in Japan." Public Health, 2024, 227: e3-e4. doi: 10.1016/j.puhe.2023.12.011.
3. Hideki Terai, Makoto Ishii, Ryo Takemura,...., Yoko Ibuka,..., Koichi Fukunaga, "Comprehensive analysis of long COVID in a Japanese nationwide prospect cohort study." Respiratory Investigation, 2023: 61(6); 802-814. doi: https://doi.org/10.1016/j.resinv.2023.08.008.
4. Dung Duc Le, Nekehia T Quashie, Martina Brandt, Yoko Ibuka, "Wealth inequalities in physical and cognitive impairments across Japan and Europe: The role of health expenditure and infrastructure." International Journal for Equity in Health, 2023, 22, Article number: 123.
5. Dung Duc Le, Yoko Ibuka, "Understanding the effects of informal caregiving on health and well-being: Heterogeneity and Mechanisms." Social Science and Medicine, 2023, 317, 115630. doi: 10.1016/j.socscimed.2022.115630.
6. Hongming Wang, Yoko Ibuka, Ryota Nakamura, "Mixing age and risk groups for accessing COVID-19 vaccines: A modeling study." BMJ Open, 2022, 12:e061139. doi: http://dx.doi.org/10.1136/bmjopen-2022-061139.
7. Shinya Tsuzuki, Yusuke Asai, Yoko Ibuka, Tomoki Nakaya, Norio Ohmagari, Niel Hens, Philippe Beutels, "Social contact patterns in Japan in the COVID-19 pandemic during and after the Tokyo Olympic Games." Journal of Global Health, 2022, Dec 3:12:05047. doi:10.7189/jogh.12.05047.
8. Kyoko Shimamoto, Eoin McElroy, Yoko Ibuka, "Health inequity in pandemic anxiety about COVID-19 infection and socioeconomic consequences in Japan: A structural equation modeling approach." Social Science and Medicine Population Health, 2022; 20: 101269, doi: 10.1016/j.ssmph.2022.101269.
9. Kensuke Nakagawara, Ho NamKoong, Hideki Terai, ...., Yoko Ibuka,..., Koichi Fukunaga, "Comprehensive and long-term survey of COVID-19 sequelae in Japan, an ambidirectional multicentre cohort study: study protocol." BMJ Open Respiratory Research, 2021; 8: e001005. doi: 10.1136/bmjresp-2021-001015.
10. Yoko Ibuka, Yui Ohtsu, "Socioeconomic status and the likelihood of informal care provision in Japan: An analysis considering survival probability of care recipients." PLoS One 2021, doi: https://doi.org/10.1371/journal.pone.0256107.
11. Yoko Ibuka, Yasumasa Matsuda, Keishi Shoji, Tsukasa Ishigaki, "Evaluation of regional variations in healthcare utilization." Japanese Journal of Statistics and Data Science 2020; 3: 349-365.
12. Shun-ichiro Bessho, Yoko Ibuka, "Interdependency in Vaccination Policies among Japanese Municipalities." Health Economics 2019; 28(2): 299-310.
13. Eric B. French, Jeremy McCauley, Maria Aragon, Pieter Bakx, Martin Chalkley, Stacey H. Chen, Bent J. Christensen, Hongwei Chuang, Aurelie Côté-Sergent, Mariacristina De Nardi, Elliott Fan, Damien Échevin, Pierre-Yves Geoffard, Christelle Gastaldi-Ménager, Mette Gørtz, Yoko Ibuka, John B. Jones, Malene Kallestrup-Lamb, Martin Karlsson, Tobias J. Klein, Grégoire de Lagasnerie, Pierre-Carl Michaud, Owen O'Donnell, Nigel Rice, Jonathan S. Skinner, Eddy van Doorslaer, Nicolas R. Ziebarth and Elaine Kelly, "End-Of-Life Medical Spending In Last Twelve Months Of Life Is Lower Than Previously Reported." Health Affairs 2017; 36(7):1211-1217.
14. Yoko Ibuka, Stacey H. Chen, Yui Ohtsu, Nobuyuki Izumida, "Medical Spending in Japan: An Analysis Using Administrative Data from A Citizen's Health Insurance Plan." Fiscal Studies, 2016; 37(3-4): 561-592.
15. Yoko Ibuka, Shun-ichiro Bessho, "Out-of-pocket Payments and Community-wide Health Outcomes: An Examination of Influenza Vaccination Subsidies in Japan." Health Economics, Policy and Law, 2016; 11: 275-302.
16. Yoko Ibuka, Shun-ichiro Bessho, "Subsidies for Influenza Vaccination, Vaccination rates, and Health Outcomes among The Elderly in Japan. " Japan and the World Economy 2015; 36: 56-66.
17. Yoko Ibuka, Yasushi Ohkusa, Tamie Sugawara, Gretchen B. Chapman, Dan Yamin, Katherine E. Atkins, Kiyosu Taniguchi, Nobuhiko Okabe, Alison P. Galvani, "Social Contacts, Vaccination Decisions and Influenza in Japan." Journal of Epidemiology and Community Health 2016; 70: 162-167.
18. Yoko Ibuka, Meng Li, Jeffrey T. Vietri, Gretchen B. Chapman, Alison P. Galvani, "Free-riding Behavior in Vaccination Decisions: An Experimental Study." PLoS One 2014; 9(1) : e87164.
19. David P. Durham, Eric M. Poolman, Yoko Ibuka, Jeffrey P. Townsend, Alison P. Galvani, "Reevaluation of Epidemiological Data Demonstrates That It Is Consistent with Cross-immunity among Human Papillomavirus Types." The Journal of Infectious Diseases 2012; 206(8): 1291-1298.
20. Yoko Ibuka, A. David Paltiel, Alison P. Galvani, "Impact of Program Scale and Indirect Effects on the Cost-effectiveness of Vaccination Programs." Medical Decision Making 2012; 32(3): 442-446.
21. Gretchen B. Chapman, Meng Li, Jeffrey T. Vietri, Yoko Ibuka, David Thomas, Haewon Yoon, Alison P. Galvani, "Using Game Theory to Examine Incentives in Influenza Vaccination Behavior." Psychological Science 2012; 23(9): 1008-1015.
22. Tamie Sugawara, Yasushi Ohkusa, Yoko Ibuka, Hirokazu Kawanohara, Kiyosu Taniguchi, Nobuhiko Okabe, "Real-time Prescription Surveillance and its Application to Monitoring Seasonal Influenza Activity in Japan." Journal of Medical Internet Research 2012; 14(1):e14.
23. Daniel Jonas, Yoko Ibuka, Louise B. Russell, "How Much Time Do Adults Spend on Health-related Self-care? Results from the American Time Use Survey." Journal of the American Board of Family Medicine 2011; 24(4): 380-390.
24. Meng Li, Gretchen B. Chapman, Yoko Ibuka, Lauren A. Meyers, Alison P. Galvani, “Who Got Vaccinated against H1N1 Pandemic Influenza? – A Longitudinal Study in Four U.S. Cities.” Psychology and Health 2012; 27(1): 101-115.
25. Yoko Ibuka, Gretchen B. Chapman, Lauren A. Meyers, Meng Li, Alison P. Galvani, “The Dynamics of Risk Perceptions and Precautionary Behavior in Response to 2009 (H1N1) Pandemic Influenza.” BMC Infectious Diseases 2010; 10:296.
26. Deborah Carr, Yoko Ibuka, Louise B Russell. "How Much Time Do Americans Spend Seeking Health Care? Racial and Ethnic Differences in Patient Experiences."Research in the Sociology of Health Care 2010, The Impact of Demographics on Health and Health Care: Ethnicity and Other Social Factors; 28:71-98.
27. Jennifer L. Lund, K. Robin Yabroff, Yoko Ibuka, Louise B. Russell, Paul G. Barnett, Joseph Lipscomb, William Lawrence, Martin L. Brown. "Inventory of Data Sources for Estimating Health Care Costs in the United States." Medical Care, Supplement 1 2009, Health Care Costs: Data, Methods, Future Directions; 47(7):S127-142.
28. Louise B. Russell, Yoko Ibuka, Deborah Carr. "How Much Time Do Patients Spend on Outpatient Visits? The American Time Use Survey." The Patient 2008; 1(3):211-222.
29. Louise B. Russell, Yoko Ibuka, Katharine G. Abraham. "Health-Related Activities in the American Time Use Survey." Medical Care 2007; 45(7):680-685.
30. Naoyuki Yoshino, Sahoko Kaji, Yoko Ibuka. "The Stabilization of an Open Economy with Capital Controls: An Analysis Using Malaysian Data." Asian Economic Papers 2003; 2(3): 63-83.