AUTHOR=Zhao Jinlong , Liu Justina Yat Wa , Fernández Daniel , Tyrovolas Stefanos 

TITLE=Development of a psychological frailty index: results from the China health and retirement longitudinal study

JOURNAL=Frontiers in Psychology

VOLUME=16

YEAR=2025

URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2025.1495733

DOI=10.3389/fpsyg.2025.1495733

ISSN=1664-1078