To investigate the influence of instrumental activities of daily living (IADL) on cognitive impairment of the older adults' population in southern Brazil. A longitudinal, population-based and home-based study that evaluates the older adults population (60 years or older) living in the city of Florianópolis, Southern Brazil. The sample at the baseline (2009/2010) was composed by 1,702 older adults. Cognitive impairment and IADL disability were investigated. A multilevel logistic model was used, in which the analyzed variables were included as the first level and time (baseline and follow-up interviews) as the second level variable. The prevalence of cognitive impairment increased from baseline to follow-up. There was an increase in the chance of the older adults presenting cognitive impairment among those with low (OR: 1.5, 95% CI: 1.0-2.3) and moderate/severe disability (OR: 3.2, 95% CI: 2.1-4.9). Adjusted probability of presenting the outcome almost doubled among those with mild disability, and were nearly four times higher among the older adults with moderate/severe disability when compared to those without disability. IADL disability can be considered an indicator of risk for clinical diagnosis of cognitive impairment. Its evaluation and follow-up are of paramount importance, especially in the older adults with mild disability, in order to avoid the progression of functional and cognitive impairment over time.
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