Prevalence of major psychiatric disorders in a cohort of oldest old in Brazil: The Pietà study

consensus discussion. Results: 639 individuals (55.3% of the total oldestold population) were fully evaluated, being 408 women (63.8%) and 231 men(36.2%),aged81.1 65.2years,withmeanschoolingof2.6 62.8years. Dementia was diagnosed in 176 subjects, (prevalence¼27.5%), while CIND was identified in 166 (prevalence¼26.0%). Among dementia patients, only 39 cases (6.1%) had a previous diagnosis of this condition. Patients with dementia were significantly older (p<0.0001) and less educated (p¼0.001). Prevalence of dementia was also higher in women, although the difference was not statistically significant (p¼0.06). CIND prevalence was similar in both genders. When compared with the cognitively healthy individuals (n¼227),CINDsubjectsweresignificantlyolder(p¼0.004),buthadasimilar schooling. A previous history of depression was more frequent among dementia (p¼0.002) and CIND (p¼0.007) patients. Conclusions: Prevalence of CIND and dementia was high in this oldest-old population, although dementia was highly under-diagnosed. Age and previous history of depression were associated with both diagnoses, while low education dementia was associated only with dementia.