Epidemiology and Risk Factors Characteristics of Alzheimer's Disease in Southwestern China: A Cross-Sectional Study.

Background: To address the regional heterogeneity of Alzheimer's disease, a large-scale epidemiological study of 12,421 elderly individuals was conducted in southwestern China to depict its unique risk characteristics. Methods: A total of 12,421 subjects were selected via cluster sampling from southwestern China after low quality data were filtered out. On the basis of investigations and medical imaging examinations, three groups were distinguished: the AD, mild cognitive impairment (MCI), and normal control groups. The risk factors for AD and MCI were analysed via a multivariate logistic regression model. Results: This study identifies a high burden of cognitive impairment in southwestern China, with 22.07% of adults aged ≥60 years exhibiting cognitive decline and 5.81% diagnosed with Alzheimer's disease rates surpassing national and global averages. Key risk factors included age >80 years, female sex, low education, rural residence, surgical history, and urological comorbidities. These findings underscore the need for region-specific prevention strategies, prioritizing older, less-educated rural women through combined cognitive and vascular interventions, while integrating cognitive screening into primary care in underserved areas for early detection and intervention. Conclusion: Elderly individuals in southwestern China exhibit a high prevalence of cognitive impairment, with AD associated with complex risk factors including established contributors like advanced age, dementia family history, alcohol abuse, and multisystem comorbidities-while notably identifying surgical history and urolithiasis as region specific risk signals. These findings underscore regional, environmental, and ethnic influences on AD pathogenesis, requiring tailored prevention/treatment. Future priorities include integrating brief cognitive screening into primary care, targeting high-risk groups (eg, undereducated rural elderly women), and establishing prospective cohorts to clarify causal links between urolithiasis, surgical history, and cognitive decline for refined region-adapted AD prevention.