Social Determinants of Health and Falls Among Community-Dwelling Older Adults: A Zero-Inflated Negative Binomial...

Falls among older adults represent a major public health challenge, yet research examining the role of social determinants of health (SDOH) in fall risk remains limited. This study aimed to identify factors associated with fall occurrence and fall frequency among community-dwelling older adults in Korea, with particular emphasis on SDOH.

A cross-sectional study design.

We used a large nationwide sample (n = 9746) from the 2023 National Survey of Older Koreans. The number of falls in the past year served as the dependent variable. Independent variables included a range of socioeconomic and environmental variables as SDOH, alongside biological and behavioral variables. A zero-inflated negative binomial (ZINB) regression analysis was employed to address excess zeros and overdispersion in fall count data.

Among participants, 94.8% experienced no falls, 3.2% reported a single fall, and 1.9% reported recurrent falls. In the logit model for fall occurrence, higher household income level, absence of age-friendly housing, higher access to parks, and lower access to welfare centers were associated with higher risk of fall occurrence. In the count model for fall frequency, higher education level, presence of age-friendly housing, and outdoor mobility barriers were associated with higher fall frequency within the at-risk group.

The findings provide empirical evidence on the critical roles of SDOH in falls among community-dwelling older adults. Specifically, a ZINB regression analysis identified distinct sets of SDOH associated with fall occurrence versus fall frequency, highlighting the complex and multifaceted nature of fall patterns among older adults.

Healthcare providers and policymakers seeking to reduce falls should implement tailored, SDOH-integrated strategies by addressing the different mechanisms underlying fall occurrence and fall frequency.