Abstract

Background: Subjective cognitive complaints (SCC) have been identified as potentially prodromal to dementia and Alzheimer's disease but research in Latin American populations is lacking. Objective: To analyze sociodemographic and clinical factors associated with incidence of SCC and cognitive decline in Chile. Methods: A prospective population-based study in a central-south county of Chile: the MAUCO cohort. We included adults (38-74 years) with a SCC questionnaire and Mini-Mental State Examination (MMSE) test at baseline and follow-up, and normal baseline cognitive assessments. Multivariate Cox regression was used to assess associations between sociodemographic, clinical factors and incidence of SCC and cognitive decline. Results: 2136 participants had cognitive assessments at baseline and follow-up. Average age was 56 years (SD 9.13), 76% female, 25% had <6 years of education. Mean follow-up was 5.0 (SD 0.64) years. Among 1504 participants without baseline SCC, 254 (16.8%) reported SCC at follow-up. Older age (HR 1.02; 95% CI 1.01-1.03), use of benzodiazepines (HR 2.14; 95% CI 1.27-3.61), antidepressants (HR 1.88; 95% CI 1.07-3.30) or depressive symptoms (HR 1.60; 95% CI 1.19-2.15) were associated to SCC incidence. Of 1646 with a normal baseline MMSE, 208 (12.6%) developed cognitive decline. The number of medications (HR 1.11; 95% CI 1.03-1.20), and baseline SCC (HR 1.40; 95% CI 1.05-1.88) were associated with cognitive decline. Conclusions: Use of benzodiazepines and antidepressants were the main factors associated with SCC, while SCC and MMSE score were the strongest predictors of cognitive decline. Both should be used to target preventive interventions.