The Double-Edged Sword of Collectivism: How Cultural Context Moderates Personality-Health Links Across U.S. States

Extensive research has demonstrated that the Big Five personality traits are closely linked to health, but these associations vary across cultural contexts. Using data from all 50 U.S. states, this study systematically examined how collectivistic culture at the regional level moderates the relationships between the Big Five traits and multiple health indicators. The results revealed multiple significant personality–culture interaction effects. Specifically, high levels of collectivism were associated with weaker links between openness and substance abuse risk, and were associated with stronger links between openness and violent mortality. This study extends the “personality–environment interaction” framework from the individual level to the regional cultural level, providing macro-regional empirical evidence for the Person–Culture Match theory. It further highlights the dual-edged nature of collectivism’s effects on health and demonstrates that these effects vary across different personality traits. Because the analyses rely on cross-sectional, state-level aggregated data, the findings should be interpreted as macro-regional associations and pattern-generating evidence rather than causal or individual-level mechanisms.