Hayami K. Koga

ORCID: 0000-0002-9716-2502
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About
Contact & Profiles
Research Areas
  • Optimism, Hope, and Well-being
  • Psychological Well-being and Life Satisfaction
  • Health disparities and outcomes
  • Climate Change and Health Impacts
  • Dietary Effects on Health
  • Mental Health via Writing
  • Mental Health Research Topics
  • Health Literacy and Information Accessibility
  • Cardiac Health and Mental Health
  • Digital Mental Health Interventions
  • Health, psychology, and well-being
  • Family Support in Illness
  • Employment and Welfare Studies
  • Workplace Health and Well-being
  • Community Health and Development
  • Fibromyalgia and Chronic Fatigue Syndrome Research
  • Family Business Performance and Succession
  • Parkinson's Disease Mechanisms and Treatments
  • Workaholism, burnout, and well-being
  • Family and Patient Care in Intensive Care Units
  • Sleep and Work-Related Fatigue
  • Youth Education and Societal Dynamics
  • Health and Well-being Studies
  • Aging and Gerontology Research
  • Maternal Mental Health During Pregnancy and Postpartum

Harvard University
2018-2025

Harvard University Press
2024

Regent University
2023

St. Brendan's Hospital
2023

Pepperdine University
2023

Portland State University
2023

Oregon Health & Science University
2023

Massachusetts Institute of Technology
2023

RTI International
2023

Chapman University
2018

The Global Flourishing Study is a longitudinal panel study of over 200,000 participants in 22 geographically and culturally diverse countries, spanning all six populated continents, with nationally representative sampling, intended annual data collection for five years on numerous aspects flourishing its determinants. A description the study, design, survey development, sampling procedures, participant characteristics provided. We report relations between composite index demographic...

10.31219/osf.io/uag5b_v1 preprint EN 2025-03-21

Despite a vast literature on subjective wellbeing (SWB), issues remain, including (a) debates around which concepts best represent it, (b) disjointed understanding of relevant factors, and (c) limited appreciation cross-national variation regarding (b). We address these using data from the Global Flourishing Study three constructs pertaining to evaluative SWB (life evaluation, life satisfaction, and, more ambiguously, happiness), examining associations with 15 childhood demographic factors...

10.31219/osf.io/jkwge_v1 preprint EN 2025-04-08

Identifying factors contributing to sustained physical functioning is critical for the health and well-being of aging population, especially as may precede predict subsequent outcomes. Prior work suggests optimism protect health, but less known about association between objective measures individuals age.

10.1001/jamapsychiatry.2023.5068 article EN JAMA Psychiatry 2024-03-20

Little is known about early-life experiences that may lead to higher optimism levels in adulthood. Using data from 202,898 adults 22 countries, we evaluated childhood candidate antecedents of optimism. We examined the associations between retrospectively reported and adult each country separately, cross-nationally by pooling results across countries. Our pooled suggest were associated with having positive relationships both parents, subjective financial status, better self-rated health,...

10.1101/2025.03.14.25323965 preprint EN medRxiv (Cold Spring Harbor Laboratory) 2025-03-17

Prior research (mainly from Western industrialized countries) documents associations between greater dispositional optimism (a generalized expectation that good things will happen) and improved health well-being. However, less is known about whether how levels of differ across countries sociodemographic groups within different countries. This study presents a cross-national exploration optimism, its variations groups. Using sample 202,898 adults 22 diverse countries, we examined the...

10.1101/2025.03.14.25323964 preprint EN medRxiv (Cold Spring Harbor Laboratory) 2025-03-17

Prior research (mainly from Western industrialized countries) documents associations between greater dispositional optimism (a generalized expectation that good things will happen) and improved health well-being. However, less is known about whether how levels of differ across countries sociodemographic groups within different countries. This study presents a cross-national exploration optimism, its variations groups. Using sample 202,898 adults 22 diverse countries, we examined the...

10.1038/s41598-024-77257-1 article EN cc-by-nc-nd Scientific Reports 2025-04-30

Little is known about early-life experiences that may lead to higher optimism levels in adulthood. Using data from 202,898 adults 22 countries, we evaluated childhood candidate antecedents of optimism. We examined the associations between retrospectively reported and adult each country separately, cross-nationally by pooling results across countries. Our pooled suggest were associated with having positive relationships both parents, subjective financial status, better self-rated health,...

10.1038/s44184-024-00109-3 article EN cc-by-nc-nd npj Mental Health Research 2025-04-30

<title>Abstract</title> Despite a vast literature on subjective wellbeing (SWB), issues remain, including (a) debates around which concepts best represent it, (b) disjointed understanding of relevant factors, and (c) limited appreciation cross-national variation regarding (b). We address these using data from the Global Flourishing Study three constructs pertaining to evaluative SWB (life evaluation, life satisfaction, and, more ambiguously, happiness), examining associations with 15...

10.21203/rs.3.rs-6420806/v1 preprint EN 2025-05-13

Optimism is associated with reduced cardiovascular disease risk; however, few prospective studies have considered optimism in relation to hypertension risk specifically. We investigated whether was a lower of developing U.S. service members, who are more likely develop high blood pressure early life. also evaluated race/ethnicity, sex and age as potential effect modifiers these associations.Participants were 103 486 hypertension-free Army active-duty soldiers (mean 28.96 years, 61.76% White,...

10.1017/s2045796020000621 article EN cc-by-nc-nd Epidemiology and Psychiatric Sciences 2020-01-01

Abstract Background Research has suggested optimism is associated with healthy aging and exceptional longevity, but most studies were conducted among non‐Hispanic White populations. We examined associations of to longevity across racial ethnic groups assessed lifestyle as a possible mediating pathway. Methods Participants from the Women's Health Initiative ( N = 159,255) completed validated measure provided other demographic health data at baseline. evaluated increments in lifespan using...

10.1111/jgs.17897 article EN Journal of the American Geriatrics Society 2022-06-08

Contemporary cross-cultural research on flourishing and development has been limited by a focus Western populations typically priorities, attention to only few indicators of flourishing, such as life satisfaction, expectancy, or GDP per capita. This paper highlights some significant challenges for robust cross-national the domains drivers flourishing. Using data from recently proposed Global Comparison Framework Gallup World Poll, we explore within- between-country heterogeneity its...

10.5502/ijw.v13i4.3555 article EN cc-by-nc-nd International Journal of Wellbeing 2023-10-31

To investigate determining factors of happiness during the COVID-19 pandemic. Observational study. Large online surveys in Japan before and A random sample 25 482 individuals who are representatives Japanese population. Self-reported measured using a 10-point Likert scale, where higher scores indicated levels happiness. We defined participants with ≥8 on scale as having high Among respondents, median score self-reported was 7 (IQR 6-8), 11 418 (45%) reporting The multivariable logistic...

10.1136/bmjopen-2021-054862 article EN cc-by-nc BMJ Open 2022-12-01

Purpose in life has been associated with diverse health outcomes; however, few studies have examined its associations progressive motor decline older adults. We tested if higher purpose would be lower likelihood of incident parkinsonism as well levels and slower rates increase parkinsonian signs.

10.1093/geronb/gbae026 article EN other-oa The Journals of Gerontology Series B 2024-02-29

Growing evidence supports optimism as a health asset, yet how influences well-being and remains uncertain. We evaluated 1 potential pathway-the association of with daily stress processes-and tested 2 hypotheses. The stressor exposure hypothesis posits that would preserve emotional by limiting to stressors. buffering higher be associated lower reactivity stressors more effective recovery from them.Participants were 233 men the Veterans Affairs Normative Aging Study who completed Minnesota...

10.1093/geronb/gbac025 article EN public-domain The Journals of Gerontology Series B 2022-02-02

Objectives. To examine whether workplace interventions to increase flexibility and supervisor support decrease work-family conflict can reduce cardiometabolic risk. Methods. We randomly assigned employees from information technology (n = 555) long-term care 973) industries in the United States Work, Family Health Network intervention or usual practice (we collected data 2009-2013). calculated a validated risk score (CRS) based on resting blood pressure, HbA1c (glycated hemoglobin), HDL...

10.2105/ajph.2023.307413 article EN American Journal of Public Health 2023-11-08

Abstract Objective Evidence suggests that greater social integration is related to lower mortality rates. However, studies among African-Americans are limited. We examined whether higher was associated with in 5306 from the Jackson Heart Study, who completed Berkman-Syme Social Network Index 2000–2004 and were followed until 2018. Methods estimated hazard ratios (HR) of by categories (i.e., high isolation, moderate isolation [reference group], integration, integration) using Cox proportional...

10.1007/s00127-023-02485-1 article EN cc-by Social Psychiatry and Psychiatric Epidemiology 2023-05-16

The aim of the current study was to validate Japanese version family supportive supervisor behaviors (FSSB-J) measure. FSSB is conceptualized as a multidimensional, superordinate construct constituted four dimensions: emotional support, instrumental role modeling behaviors, and creative work-family management.The translated back-translated FSSB-J questionnaire administered 1,670 men women aged 20-59 years who were registered with online survey company in November 2017. Confirmatory factor...

10.3389/fpsyg.2019.02628 article EN cc-by Frontiers in Psychology 2019-11-22

Objectives: Associations of stress-related coping strategies with lifespan among the general population are understudied. Coping characterized as being either adaptive or maladaptive, but it is unknown degree to which variability in tailoring their implementation different contexts may influence lifespan.

10.1080/10615806.2023.2288333 article EN Anxiety Stress & Coping 2023-11-29
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