Adequate housing as a social determinant of the health of international migrants and locals in Chile between 2013 and 2022

Adequate housing is a fundamental right and a social determinant of health. It also represents a historically contentious topic in Latin America. Migratory flows to Chile have become increasingly precarious in the past few years, limiting opportunities for adequate housing, with potential repercussions on the health of international migrants and the general population. This study aims to analyse adequate housing as a social determinant of health among international migrants and locals between 2013 and 2022 in Chile. Observational cross-sectional study based on repeated versions of the nationally representative Socioeconomic Characterization Survey in Chile. Adequate housing indicators adapted from the United Nations Housing Rights Programme guidelines were analyzed with relation to individual health, distinguishing between the local and international migrant populations. Logistic regression models were fitted for housing indicators with migration as the main independent variable and for short-term and long-term healthcare needs in locals and immigrants with housing as the main dependent variables. Models were adjusted for sociodemographic variables and considered the complex sample design. Descriptive findings indicated higher availability of services and infrastructure among international migrants, and a disadvantage for habitability, location, and affordability by quintiles compared to locals. Logistic regression models, adjusting for demographic variables, revealed significant associations between migration status and overcrowding (OR 6.14, 2022), poor housing materiality (OR 5.65, 2022) and proximity to healthcare centres (OR 1.4, 2022) compared to locals. Experiencing hazardous situations consistently predicted short-term healthcare needs in both migrants (OR = 1.4, 2022) and locals (OR = 2.8, 2022). Overcrowding predicted both long and short-term healthcare needs among locals across the years and long term needs among migrants in 2013 and 2015. We found significant inequities in adequate housing between migrant populations and locals in Chile, and some inequities among both populations based on structural socioeconomic deprivation. Experiencing hazardous situations emerged as a social determinant of health among international migrants in 2022, potentially suggesting growing challenges related to social exclusion in urban areas. However, limitations such as exclusion criteria of the survey and sample sizes for data on the migrant population potentiall