Hayami Koga

Biography

Publications

• The Bright Side of Life: Optimism and Risk of Dementia.

  Stenlund S, Koga HK, James P, Farmer J, McGrath CB, Grodstein F, Kubzansky LD. J Am Geriatr Soc 2026

  PMID: 41947615

• Exploring associations of three evaluative subjective wellbeing measures (Cantril's ladder, life satisfaction, happiness) with 15 childhood and demographic factors across 22 countries.

  Lomas T, Koga HK, Padgett RN, Pawelski JO, Kim ES, Makridis CA, Gundersen C, Bradshaw M, Pertel NL, Shiba K, Felton C, Helliwell JF, Johnson BR, VanderWeele TJ. Sci Rep 2026 Feb 10

  PMID: 41667545

• Work Unit Conditions and Emotional Exhaustion: A Multilevel Study of Healthcare Workers.

  Koga HK, McNamara TK, Kelly EL, Kubzansky LD, Berkman LF. J Occup Environ Med 2026 Mar 01

  PMID: 41105124

• The distribution of optimism across sociodemographic groups in 22 countries.

  Chen Y, Kubzansky LD, Kim ES, Koga H, Shiba K, Padgett RN, Wilkinson R, Johnson BR, VanderWeele TJ. Sci Rep 2025 Apr 30

  PMID: 40307250

• When the glass is half full: early life experiences and adult optimism in 22 countries.

  Chen Y, Kubzansky LD, Kim ES, Koga H, Shiba K, Padgett RN, Wilkinson R, Johnson BR, VanderWeele TJ. Npj Ment Health Res 2025 Apr 30

  PMID: 40307504