Neighborhood deprivation and household socioeconomic status as risk factors for diabetes in Brussels

BACKGROUND: Socioeconomic (SE) differences in diabetes prevalence have been shown both at the individual and neighborhood level. Disentangling the role of SE determinants of diabetes at different levels can help to identify more targeted strategies to reduce SE differences in diabetes prevalence. As contextual factors may differ it is important to explore this in different settings. In this study we investigated the association of diabetes with household socioeconomic status (SES) and neighborhood deprivation in Brussels taking into account individual risk factors. METHODS: The study sample included participants ≥ 15 years of the Belgian National Health Interview Survey (HIS) 2013 and 2018 residing in Brussels (n = 5045). Information on neighborhood deprivation, assessed through a composite indicator (income, employment, nationality,..), was linked to the HIS data. A multilevel analysis was conducted to assess the association of self-reported diabetes with household SES and neighborhood deprivation adjusting for age, sex, obesity, nationality and country of birth. RESULTS: The overall prevalence of diabetes in the study sample was 6.8%. Individual risk factors associated with a higher diabetes prevalence were older age, obesity and being born outside the EU. Belonging to a household with a low income (OR 2.3;95% CI 1.2-2.5 - ref. highest income group), low education at household level (OR 1.6;95% CI 1.0-2.5 - ref. highest education group) and living in a deprived neighborhood (OR 2.0, 95%CI 1.3-3.1 - ref. living in wealthy area) were all independently associated with a higher diabetes prevalence. CONCLUSIONS: Neighborhood deprivation and low household SES are independent risk factors of diabetes. Actions to reduce SE differences in diabetes prevalence should take into account determinants at the individual, household and neighborhood level. Further research should explore the role of environmental risk factors to explain the higher diabetes prevalence in deprived areas. KEY MESSAGES: • Differences in diabetes prevalence between rich and poor neighborhoods remain when accounting for individual characteristics and household socioeconomic status. • Environmental factors may explain the higher diabetes prevalence in deprived neighborhoods.