Telemedicine Uptake During and After Pandemic-Era Deregulation in Japan
Kazuki Ohashi, Kazuhiro Abe, Yoko Shizawa, Zhao Jieyu, Machiko Ukai, Shigekazu Komoto, Katsuhiko Ogasawara
JAMA Network Open, 9, 1, e2553150, e2553150, American Medical Association (AMA), 2026年01月09日
研究論文（学術雑誌）, This cross-sectional study assesses the uptake of telemedicine during and after the COVID-19 pandemic–era deregulation period in Japan.

Assessing regional healthcare service efficiency in China: a ten-year data envelopment analysis [2010–2019]
Jieyu Zhao, Katsuhiko Ogasawara
Journal of Hospital Management and Health Policy, 8, 23, 23, AME Publishing Company, 2024年12月
研究論文（学術雑誌）

Are There Shortages and Regional Disparities in Lecanemab Treatment Facilities? A Cross-Sectional Study.
Kazuki Ohashi, Ikuko Takahashi-Iwata, Zhao Jieyu, Ken Sakushima, Ichiro Yabe, Katsuhiko Ogasawara
Health services insights, 17, 11786329241299312, 11786329241299312, 2024年, ［国際誌］
英語, 研究論文（学術雑誌）, INTRODUCTION: Alzheimer disease (AD) is the most common type of dementia, affecting 70% of patients with dementia. In Japan, over 5 million people aged 65 years and older had dementia in 2018, and this figure is expected to rise to 25% to 30% of this age group by 2045. In Japan, lecanemab, which was approved in 2023, is expected to be a new treatment for AD. However, lecanemab requires stringent management, including amyloid PET scans and MRI monitoring, necessitating specialized facilities, creating concerns regarding the lack of treatment facilities and poor treatment access. METHODS: This study assessed spatial accessibility to lecanemab in Hokkaido, Japan, using geographic information system data. Hospitals were categorized into 3 scenarios based on their capacity to meet the treatment criteria. Service area analysis in each scenario evaluated the population coverage within 30-, 60-, and 120-minute travel times. The inverted two-step floating catchment area method was used to calculate the potential high-demand areas index (PHDI) for each hospital. RESULTS: Population coverage ranged from 56% to 97%, depending on the scenario and travel time. Coverage for the most feasible scenario (Scenario 1) was 56%, 73.9%, and 88.3% within 30, 60, and 120 minutes, respectively. Northern and southern Hokkaido had the lowest coverage. PHDI analysis identified high-demand areas, with Sapporo facing potential overcapacity issues. CONCLUSION: Lecanemab highlights the need for strategic resource allocation to enhance accessibility and capacity. Establishing additional treatment centers, particularly in areas with poor accessibility and capacity, is crucial to maximize the benefits of treatment for dementia.

Measuring the Inequalities in the Distribution of Public Healthcare Resources by the HRDI (Health Resources Density Index): Data Analysis from 2010 to 2019.
Jieyu Zhao, Yuchen Yang, Katsuhiko Ogasawara
Healthcare (Basel, Switzerland), 10, 8, 2022年07月27日, ［国際誌］
英語, 研究論文（学術雑誌）, BACKGROUND: In China, a developing country, the imbalance of development exists in different fields, and the inequalities in the distribution of healthcare services have garnered increasing attention. This study aimed to assess the healthcare services allocation and compare the latest distribution ratios of the essential healthcare indicators with the national requirement values announced by the government to research the level of healthcare development in China. METHODS: Data were extracted from the Chinese Statistical Yearbook (2010-2019). The Healthcare Resource Density Index (HRDI) was used to evaluate equity in the demographic and geographical dimensions. The requirement values related to the ratio of doctors, nurses, and institution beds per thousand people were drawn from government documents. The data of healthcare serviceability indicators were compared with those requirements to check the situation of each province's medical development. RESULTS: From 2010 to 2018, there was a sustainable upward trend in government investment, however, a noticeable drop in the investment in northeast areas was seen. Although the HRDI of the institutions, beds, doctors, and nurses experienced some small fluctuations over the years, the developing areas in the middle-west areas had almost approached the level of developed east areas. There were only four provinces that met the requirements of the government in all three indicators (the ratio of institution beds, doctors, and nurses per thousand people). CONCLUSION: The equality of the distribution of healthcare services in China was unfair between the eastern and middle-western areas. The government launched the developing requirements and paid additional attention to narrowing the imbalance among different economic level regions to meet the needs of the local people. Although many provinces did not meet the requirements for medical resources in 2019, the distribution of healthcare services was approached relatively equitably countrywide.

2つの方法による中国の医療制度資源の平等性の分析
ZHAO Jieyu, OGASAWARA Karsuhiko, 医療情報学連合大会論文集(CD-ROM), 43rd, 2023年

北海道におけるCOVID-19パンデミック前後の疾患別死亡率の変動に関する研究　　　　　　　　　　　　　　　
趙捷宇, 大橋和貴, 杉村直孝, 小笠原克彦
第44回医療情報学連合大会, 2024年11月23日, 日本語
2024年11月21日 - 2024年11月24日

中国の医療制度における医療資源の公平性に関する二つの手法による分析　　　　　　　　　　　　　　　
Zhao Jieyu, Katsuhiko Ogasawara
第43回医療情報学連合大会, 英語