Yes. Results from São Paulo Ageing and Health Study, published in 2008, showed that non-skilled occupation and unfavourable personal income increased the risk of dementia. Illiteracy and a cumulative effect of socioeconomic adversities across the life-course were also associated with higher prevalence of dementia in São Paulo (Scazufca et al., 2010).

References:

Scazufca, M., Almeida, O. P., & Menezes, P. R. (2010). The role of literacy, occupation and income in dementia prevention: The São Paulo Ageing & Health Study (SPAH). International Psychogeriatrics, 22(8), 1209–1215. https://doi.org/10.1017/S1041610210001213