We could not find any specific evidence on that. However, we would assume that some of these factors are: stigma, lack of knowledge on dementia among society and even among healthcare professionals, the belief that living with dementia is natural as a person gets older, and “devaluation” of persons living with dementia. According to Blay and Peluso (2010), fewer years of education are associated with higher probability of stigmatizing people with Alzheimer (Blay & Peluso, 2010). In addition, Blay and Peluso (2008), showed that marital and economic status (besides level of education) influence responses about causes of Alzheimer’s Disease (AD). Married or previously married people showed a tendency to attribute AD to psychosocial causes, while people with unfavourable economic status tended to attribute AD to more biological origins, and people with 0 to 7 years of education attributed AD to spiritual/moral causes (Blay & de Toledo Piza Peluso, 2008).

References:

Blay, S. L., & de Toledo Piza Peluso, E. (2008). The public’s ability to recognize Alzheimer disease and their beliefs about its causes. Alzheimer Disease and Associated Disorders, 22(1), 79–85. https://doi.org/10.1097/WAD.0b013e31815ccd47

Blay, S. L., & Peluso, E. T. P. (2010). Public stigma: The community’s tolerance of Alzheimer disease. The American Journal of Geriatric Psychiatry, 18(2), 163–171. https://doi.org/10.1097/JGP.0b013e3181bea900