相澤 俊明 (アイザワ トシアキ)
| 経済学研究院 現代経済経営部門 経済分析分野 | 准教授 |
| 高等教育推進機構 | 准教授 |
| Ｏｎｅ Ｈｅａｌｔｈリサーチセンター | 准教授 |
Last Updated :2025/12/04
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論文
- Socio-economic gradients in hypertension and diabetes management amid the COVID-19 pandemic in India.
Toshiaki Aizawa
PloS one, 20, 4, e0315867, 2025年, ［査読有り］, ［筆頭著者］, ［国際誌］
英語, 研究論文（学術雑誌）, This study examines socio-economic inequalities in the prevalence and treatment of hypertension and diabetes among adults in India, utilising data from the National Family Health Survey (NFHS) collected before and during the COVID-19 pandemic. Disparities associated with individual demographic and socio-economic characteristics are measured, with the level of inequality quantified using the dissimilarity index and contributing factors analysed through decomposition analysis. The results reveal significant socio-economic gradients, with wealthier individuals more likely to have elevated blood pressure and blood glucose levels and to treat them. Socio-economic gradients in treatment are even steeper among middle-aged groups during the pandemic. These wealth- and education-related disparities become more pronounced with age. This study highlights the need for targeted interventions and policies to address socio-economic disparities in access to essential care for socio-economically disadvantaged populations. - Employee well-being in the digital age: Assessing the impacts of a smartphone application in the workplace.
Toshiaki Aizawa, Hiroko Okudaira, Ritsu Kitagawa, Sachiko Kuroda, Hideo Owan
Economics and Human Biology, 55, 101445, 101445, 2024年12月, ［査読有り］, ［筆頭著者］, ［国際誌］
英語, 研究論文（学術雑誌）, Recently, providing smartphone-based health-improving applications to employees has emerged as a promising strategy for sustaining their well-being. This study estimates the impact of the routine use of an application, introduced in 2020 by a Japanese manufacturing company, on various health-related behaviours and outcomes among employees by exploiting a distinctive large-scale longitudinal dataset and personnel records. The analysis addresses potential selection biases arising from the non-random nature of application usage by employing the instrumental variable approach. Regular application use generates significant positive impacts on health-related habits, including moderate alcohol consumption, regular breakfast intake and refraining from eating two hours before bedtime. Furthermore, regarding physical and psychological stress, noteworthy reductions in physical burden and less frequent experiences of annoyance are observed. Employees also report a lower frequency of dizziness, headaches and palpitations, albeit an increase in the frequency of strained eyes is noted. Additionally, application use is associated with lower systolic and diastolic blood pressure, as well as decreased levels of triglycerides and gamma-GTP. - Middle Managers and Employee Health
OKUDAIRA Hiroko, KITAGAWA Ritsu, AIZAWA Toshiaki, KURODA Sachiko, OWAN Hideo
RIETI Discussion Paper, 2024年04月 - Long-Term Trends and Sociodemographic Inequalities of Emotional/Behavioral Problems and Poor Help-Seeking in Adolescents During the COVID-19 Pandemic
Ryo Morishima, Akiko Kanehara, Toshiaki Aizawa, Naohiro Okada, Kaori Usui, Haruko Noguchi, Kiyoto Kasai
Journal of Adolescent Health, 74, 3, 537, 544, 2024年03月, ［査読有り］
研究論文（学術雑誌） - Does the conditional maternal benefit programme reduce infant mortality in India?
Toshiaki Aizawa
Health Policy and Planning, Oxford University Press (OUP), 2022年08月23日, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌）, Abstract
India, which suffers from the largest number of infant deaths in the world, introduced the conditional maternity benefit programme, ‘Indira Gandhi Matritva Sahyog Yojana’ (IGMSY), to provide cash directly to pregnant and lactating women contingent on specified maternal and infant healthcare uses. This study estimates the impact of this programme on infant mortality for the first 12 months after birth, exploiting the pilot phase of IGMSY as a natural experiment in which 52 districts were randomly chosen as pilot districts. In the matched-pair difference-in-differences framework, the treatment effect on survival rate is estimated through the fully data-driven random survival forest approach. The results show that IGMSY reduced the infant mortality rate by 8.32% in treatment districts, with 1.53 fewer deaths per 1000 live births [95% prediction interval: 1.26–1.80]. The size of the effect substantially varies even within the first 12 months, indicating larger reductions in the neonatal period, and after the first 6 months. The results also reveal greater reductions among boys and children in urban areas. - Inequality in health opportunities in Indonesia: long-term influence of early-life circumstances on health
Toshiaki Aizawa
BMC PUBLIC HEALTH, 22, 1, 2022年07月, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌） - Educational Gradient in Physiological Risk Factors in a Workplace: A decomposition analysis of biomarkers
Toshiaki Aizawa
RIETI discussion paper, 2022年05月 - Inequality of Opportunity in Infant Mortality in South Asia: A Decomposition Analysis of Survival Data
Toshiaki Aizawa
Economics and Human Biology, 2021年08月, ［査読有り］, ［筆頭著者］ - Dynamic variation in receptive vocabulary acquisitions: Further evidence from the Young Lives study
Toshiaki Aizawa
Cognitive Development, 58, 2021年04月, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌） - Decomposition of Improvements in Infant Mortality in Asian Developing Countries Over Three Decades
Toshiaki Aizawa
Demography, 58, 1, 137, 163, 2021年02月01日, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌） - Re-visiting the Conditional Cash Transfer in India through the Partial Identification Approach
Toshiaki Aizawa
Journal of Development Studies, 58, 4, 768, 786, 2021年, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌） - Inequality in the treatment of diabetes and hypertension across residency status in China
Toshiaki Aizawa
Ethnicity and Health, 26, 4, 512, 529, 2021年, ［査読有り］, ［筆頭著者］, ［国際誌］
英語, 研究論文（学術雑誌） - Levels of and changes in socioeconomic inequality in delivery care service: A decomposition analysis using Bangladesh Demographic Health Surveys
Mohammad Habibullah Pulok, Gowokani Chijere Chirwa, Jacob Novignon, Toshiaki Aizawa, Marshall Makate
PloS one, 15, 11, 2020年11月, ［査読有り］ - Do cash transfers increase nutritional intakes? Experimental evidence from an unconditional cash transfer in Kenya
Toshiaki Aizawa
Health Policy and Planning, 35, 7, 784, 798, 2020年08月01日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌） - Does the expanded eligibility of conditional cash transfers enhance healthcare use among socio-economically disadvantaged mothers in India?
Toshiaki Aizawa
Journal of Development Effectiveness, 12, 2, 164, 186, 2020年04月, ［査読有り］
研究論文（学術雑誌） - Joint impact of the conditional cash transfer on child nutritional status and household expenditure in Indonesia
Toshiaki Aizawa
Journal of Human Capital, 14, 1, 122, 164, 2020年03月01日, ［査読有り］
研究論文（学術雑誌） - Housing Inequality in Developing Asia and the United States
Toshiaki Aizawa, Matthias Helble, Kwan Ok Lee
Cityscape, 22, 2, 23, 60, 2020年01月, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌） - Re-evaluating the early child stimulation programme in Bangladesh: evidence from the partial identification approach
Toshiaki Aizawa
Journal of Development Effectiveness, 12, 4, 298, 322, 2020年, ［査読有り］
研究論文（学術雑誌） - Trajectory of inequality of opportunity in child height growth: Evidence from the Young Lives study
Toshiaki Aizawa
Demographic Research, 42, 7, 165, 202, 2020年, ［査読有り］
研究論文（学術雑誌） - The impact of health insurance on out-of-pocket expenditure on delivery in Indonesia
Toshiaki Aizawa
Health Care for Women International, 40, 12, 1374, 1395, 2019年12月02日, ［査読有り］
研究論文（学術雑誌） - Ex-ante Inequality of Opportunity in Child Malnutrition: New Evidence from Ten Developing Countries in Asia
Toshiaki Aizawa
Economics and Human Biology, 35, 144, 161, 2019年12月, ［査読有り］
研究論文（学術雑誌） - Impacts of the community block grant programme on school resources, environment and management in Indonesia
Toshiaki Aizawa
Education Economics, 27, 5, 521, 545, 2019年09月03日, ［査読有り］
研究論文（学術雑誌） - Urban developments and health: Evidence from the distributional analysis of biomarkers in China
Toshiaki Aizawa
SSM - Population Health, 8, 2019年08月, ［査読有り］
研究論文（学術雑誌） - Transition of the BMI distribution in India: evidence from a distributional decomposition analysis
Toshiaki Aizawa
Journal of Bioeconomics, 21, 1, 3, 36, 2019年04月, ［査読有り］
研究論文（学術雑誌） - Regional Disparity in the Body Mass Index Distribution of Indonesians: New Evidence Beyond The Mean
Toshiaki Aizawa
Bulletin of Indonesian Economic Studies, 54, 1, 85, 112, 2018年01月02日, ［査読有り］
研究論文（学術雑誌） - Socioeconomic inequality in excessive body weight in Indonesia
Toshiaki Aizawa, Matthias Helble
Economics and Human Biology, 27, 315, 327, 2017年11月, ［査読有り］
研究論文（学術雑誌） - International trade and determinants of price differentials of insulin medicine
Matthias Helble, Toshiaki Aizawa
Health Policy and Planning, 32, 1, 1, 10, 2017年02月, ［査読有り］
研究論文（学術雑誌） - Sources of Income Inequality: A Comparison of Japan and the United States
Toshiaki Aizawa, Robert Dekle, Matthias Helble
ADBI Working Paper, 663, 2017年, ［筆頭著者］ - Urbanization and Inequality in Hypertension Diagnosis and Medication in Indonesia.
Toshiaki Aizawa, Matthias Helble
ADBI Working Paper, 556, 2016年, ［筆頭著者］ - Determinants of Tenure Choice in Japan: What Makes You a Homeowner?
Toshiaki Aizawa, Matthias Helble
ADBI Working Paper, 625, 2016年, ［筆頭著者］ - Health and Home Ownership: Findings for the Case of Japan
Toshiaki Aizawa, Matthias Helble
ADBI Working Paper, 525, 2015年, ［筆頭著者］
書籍等出版物
担当経験のある科目_授業
共同研究・競争的資金等の研究課題
- 企業内人的資本投資の計測と生産性メカニズムの解明
科学研究費助成事業
2023年04月 - 2028年03月
大湾 秀雄, 相澤 俊明, 黒田 祥子, 高橋 新吾, 川口 大司, 佐藤 香織
日本学術振興会, 基盤研究(A), 早稲田大学, 23H00056 - 南アジアにおける幼児死亡率の不平等性とその推移に関する実証研究
科学研究費助成事業 若手研究
2021年04月 - 2024年03月
相澤 俊明
昨年度は、データの収集、統計分析のプログラムの開発、データの分析を主に行った。本研究のテーマである、「南アジア地域における幼児死亡率の社会経済的な不平等性」を定量的に扱うためのフレームワークを整理し、社会経済状況に応じた幼児死亡率の差を分析するための分析手法を開発した。機械学習の考え方を応用させることで、従来では明らかにされてこなかった不平等性の要因をデータから読み解くことを試みた。
幼児死亡率が依然として高い、南アジア5か国（アフガニスタン、バングラデッシュ、インド、ネパール、パキスタン）の最新の家計調査データ（２次データ利用）を用いて分析を行ったところ、高い社会経済的ステータスをもつ家庭に生まれた子供と、低い社会経済的ステータスを持つ家庭に生まれた子供の間で、生後１２か月の間の死亡率（幼児死亡率）に有意な差が見られた。観察された差を分解分析したところ、母親の出産時の年齢等のデモグラフィックな要素の違いに起因する差、両親の教育水準の差に起因する差、家計の生活水準の差に起因する差が観察された死亡率の差と強く関連していたことが明らかになった。これらの結果は、不平等性を是正するためには、社会的にハンディキャップを抱える家庭の子供たちに優先的に政策介入をしていくことの重要性を示唆している。昨年度はこの分析結果を論文にまとめで学術雑誌に投稿したところ、論文の分析手法の開発に関する貢献が評価され、論文はEconomics and Human Biology誌に掲載された。
日本学術振興会, 若手研究, 早稲田大学, 研究代表者, 21K13318
