Hossein Ghasemzadeh - Department of Ageing, Research Center on Ageing, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Ahmadali Akbari Kamrani - Department of Ageing, Research Center on Ageing, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Yadollah Abolfathi Momtaz - Department of Ageing, Research Center on Ageing, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Mehdi Rassafiani - Department of Ageing, Research Center on Ageing, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Fatemeh Nourhashemi - Department of Ageing, Research Center on Ageing, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Robab Sahaf - Department of Occupational Therapy, Faculty of Allied Health Sciences, Kuwait University, Kuwait.

Objectives: Dementia is the fifth cause of death in older adults with the most significant financial, social, and caring burden on health systems across the world. The aim of this study was to determine the most common medical risk factors for dementia in the retired population. Methods: A case-control methodology was used for this study, within which ۱۸۰ patients with dementia were compared to ۳۷۱ controls for medical risk factors in the National Iranian Oil Company (NIOC) in ۲۰۱۷. Participants in the case and control groups were matched in terms of age, educational level, and sex. The logistic regression was employed to estimate Odds Ratios (OR), using SPSS software. Results: The majority of the participants were male (۵۵%) and married (۶۹%) with a mean age of ۷۳.۱۴ (SD=۹.۱۱) and high school education (۳۸%). The results of the adjusted logistic regression showed a significant association among dementia and chronic and acute vitamin D۳ deficiency (more and less than ۱ year) (OR=۴.۷۳, P<۰.۰۰۱, OR=۷.۵۰, P<۰.۰۰۱, respectively), cancer history (OR=۱۵.۳۱, P<۰.۰۰۱), and chronic anemia (OR=۵.۹۵, P<۰.۰۰۱). Discussion: The results of this study suggest vitamin D۳ deficiency, cancer, and anemia history as probable risk factors for dementia. Thus, managing or controlling these risk factors may effectively delay or prevent the onset of dementia for the individuals.

Dementia, Risk factors, Older adults, NIOC