Social capital and all-cause mortality before and during the COVID-19 pandemic among middle-aged and older people: Prospective cohort study in Poland.

Prior to the pandemic, studies demonstrated the mainly protective role of structural social capital on all-cause mortality, less evidence had been found for a protective role for cognitive social capital. However, some findings from the early stage of the pandemic suggest that civic participation and group affiliation may be associated with more COVID-19-related deaths, as was interpersonal trust. Thus, the study aimed to verify indicators of individual social capital as risk factors for 7.6-year all-cause mortality before COVID-19 pandemic and 1.6-year all-cause mortality during of the pandemic among men and women aged 50+ years in Poland. The Polish part of the COURAGE in Europe cross-sectional baseline study was conducted in 2011. The analysis included 2913 face-to-face interviews with randomly selected community-dwelling individuals. Information about deaths was obtained from the State Systems Department on Oct 7, 2021. Various aspects of structural and cognitive social capital were measured. The Cox proportional hazard models were used. Before the pandemic, a protective effect of structural (formal and informal social participation) and cognitive social capital (trust in family, trust in co-workers) on the risk of death was observed in women. However, a negative effect of cognitive social capital (trust in strangers) was found for women and men. No positive effect of social capital during the pandemic after controlling for the health-related characteristics was found. A negative effect of generalized trust on all-cause mortality during the pandemic was discerned for men, a negative effect of the level of one's social network was found in women. The observed patterns of relationships were totally different for analyzed periods of time, and different for men and women. Consequently, planning of social interventions directed towards middle and older age groups should consider various actions for men and women separately. The need for continuous evaluation of implemented social interventions was emphasized.