Health Services Research

Principal Investigator Nanako Tamiya
E-mail.address ntamiya@md.tsukuba.ac.jp
URL https://hsr.md.tsukuba.ac.jp
Other Faculty Members
Professor Masao Iwagami:iwagami@md.tsukuba.ac.jp
Professor Takehiro Sugiyama: tsugiyama@md.tsukuba.ac.jp
Associate Professor Taeko Watanabe:watanabe.taeko@md.tsukuba.ac.jp

Assistant Professor Kazuaki Uda: uda.kazuaki.gn@u.tsukuba.ac.jp
Assistant Professor Jun Komiyama: jkomiyama@md.tsukuba.ac.jp
Assistant Professor Yuta Taniguchi: taniguchi.yuta.ga@u.tsukuba.ac.jp
Assistant Professor Son yu: sunyu@md.tsukuba.ac.jp
Assistant Professor Felipe Sandoval: sandoval.felipe.ga@u.tsukuba.ac.jp
Major Scientific Interests of the GroupWe assess and analyze the quality of various medical services (including nursing, health and welfarecare) using the health services research method. Our goal is to improve the quality of services via
outcome research though an interdisciplinary research approach. We use verified data to help realize
the idea of medical care in harmony with life.
Projects for Regular Students in Doctoral or Master’s Programs1) Useful regional indicators for the planning of long-term care projects (assistance): using claim datafrom the national long-term care system and others.
2) Verification of the method of linking medical care information and construction of logic andregional difference analysis of medical care3) Study on factor analysis of healthy life expectancy and regional disparity and validation of healthpromotion measures
Study Programs for Short Stay Students (one week – one trimester)Part of the aforementioned projects 1) ~ 3)
Selected Publications

1) Jin X, Tamiya N, Uda K, Yasunaga H. The impact of additional payments on functional decline among longterm care health facility residents in Japan. Age and Ageing, 50(6):2055-2062, doi: 10.1093/ageing/afab121,2021. IF=10.668
2) Sato M, Tamiya N, Jin X, Watanabe T, Takahashi H, Noguchi H. Impact of a Japanese Incentivization
Program to Increase End-of-Life Care Outside of Hospitals. Journal of the American Medical Directors
Association, 22(2):329-333, doi: 10.1016/j.jamda.2020.09.021, 2021. IF=4.367
3) Abe K, Kawachi I, Taniguchi Y, Tamiya N. Municipal characteristics of in-home death among caredependentolderJapaneseadults.
JAMANetwOpen,2022;5(1):e2142273,doi:10.1001/jamanetworkopen.2021.42273, 2022. IF=8.485
4) Taniguchi Y, Kuno T, Komiyama J, Adomi M, Suzuki T, Abe T, Ishimaru M, Miyawaki A, Saito M, Ohbe H,Miyamoto Y, Imai S, Kamio T, Tamiya N, Iwagami M. Comparison of patient characteristics and in-hospitalmortality between patients with COVID-19 in 2020 and those with influenza in 2017-2020: a multicenter,retrospective cohort study in Japan. Lancet Reg Health West Pac, 20:100365, doi: 10.1016/j.lanwpc.2021.100365,2022. IF=8.559

5) Komiyama J, Iwagami M, Mori T, Kuroda N, Jin X, Ito T, Tamiya N. Factors Associated with Outpatient
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Cardiac Rehabilitation Participation in Older Patients: A Population-Based Study Using Claims Data fromTwo Cities in Japan. Annals of Clinical Epidemiology, 4 (1): 11–19, 2022
Sun Y, Iwagami M, Komiyama J, Sugiyama T, Inokuchi R, Sakata N, Ito T, Yoshie S, Matsui H, Kume K, SanukiM, Kato G, Mori Y, Ueshima H, Tamiya N. Association between types of home healthcare and emergency housecalls, hospitalization, and end-of-life care in Japan. Journal of the American Geriatrics Society (JAGS),
https://doi.org/10.1111/jgs.18268, 2023. IF=7.538
Hamasaki Y, Sakata N, Jin X, Sugiyama T, Morita K, Uda K, Matsuda S, Tamiya N. Facility staffing associatedwith potentially avoidable hospitalizations in nursing home residents in Japan: a retrospective cohort study. BMC
Geriatr. 2023 Sep 15;23(1):566, 2023．IF=4.1
Sakamoto A, Inokuchi R, Iwagami M, Sun Y, Tamiya N. Association between advanced care planning andemergency department visits: A systematic review. The American Journal of Emergency Medicine, 2023
Jun:68:84-91. doi: 10.1016/j.ajem.2023.03.004. IF= 4.093
Kuroda N, Tamiya N. Excess mortality among adults with mental disorders treated in psychiatric and general
medical settings: A population-based cohort study using municipal medical claims data in Japan. Asian Journal ofPsychiatry, 88:103719, doi: 10.1016/j.ajp.2023.103719, 2023. IF=9.510) Kawamura C, Iwagami M, Sun Y, Komiyama J, Ito T, Sugiyama T, Bando H, Tamiya N. Factors associated withnon participation in breast cancer screening: analysis of the 2016 and 2019 comprehensive survey of living
conditions in Japan. Breast Cancer, doi: 10.1007/s12282-023-01486-x, 2023 .IF=4.0