147 Socioeconomic determinants of multimorbidity among migrants undergoing regularization in Geneva, Switzerland

Abstract EP3.5, e-Poster Terminal 3, September 5, 2025, 13:05 - 13:30 Aims We aimed to assess the influence of pre-and post-migration socioeconomic determinants and the likelihood of developing multimorbidity in a cohort of undocumented migrants and migrants undergoing regularization over four follow-up waves. Methods We used data from the “Parchemins study”, a prospective cohort study that followed migrants as they are regularized in Geneva, Switzerland. We used data on 18 self-reported health disorders, grouped them by body system, and then created the variables of basic multimorbidity (co-occurrence of two or more health disorders) and complex multimorbidity (disorders affecting three or more body systems). We used longitudinal logistic regression to assess the association of the material, psycho-social, behavioural, and structural determinants distinguished by migration stage (pre-and-post) with the development of multimorbidity. Results The presence of basic multimorbidity is 50.1%, 55.6%, 54.2% and 54.2% in waves 1, 2, 3, and 4, respectively, while for complex multimorbidity is 21.0% 27.3%, 25.0%, and 26.9%, respectively. Higher education attainment is associated with less probability of developing complex multimorbidity compared with less than secondary. Participants who work in food preparation are less likely to develop complex multimorbidity, circulatory and musculoskeletal disorders compared to those who work as cleaners and helpers. Higher salary, having emergency savings and good accommodation status are protective factors for the development of multimorbidity outcomes. There is a clear association between being physically active with less likelihood of developing multimorbidity. Undergoing regularization showed a protective effect for developing multimorbidity outcomes, cardiovascular, musculoskeletal and mental disorders, but no for metabolic disorders. Conclusions Post-migration determinants are more influential for the development of multimorbidity than pre-migration determinants. To prevent multimorbidity among irregular migrants, we need to improve work conditions for high-risk jobs, support regularization, and promote physical activity.