Cognitive impairment in individuals with low educational level and homogeneous sociocultural background

Prevalence studies of dementia and cognitive impairment in different cultures and environments are necessary. OBJECTIVE: To verify the prevalence of cognitive impairment and dementia in a rural homogeneous population from flooded areas in the Amazonian Basin. METHODS: A total of 163 subjects were interviewed with neurological, cognitive and functional evaluation. The individuals were classified as demented or cognitive impairment no dementia (CIND). RESULTS: cognitive impairment was observed in 11.4% (n=18 individuals). Ten out of the 18 were diagnosed as CIND and eight with dementia. The prevalence rate of dementia was 4.9% in subjects aged 50 years or over and of CIND was 6.1%. Considering only the elder group (>64 years of age), there was a 12.3% prevalence of dementia and 7.7% of CIND. CONCLUSION: In a homogeneous population, we observed a similar prevalence of dementia to rates reported by studies in Brazil and in other developed and developing countries.

开展不同文化与环境背景下痴呆症及认知障碍的流行性病学研究具有必要性。
研究目的：明确亚马逊流域洪涝地区乡村同质人群中认知障碍与痴呆症的患病率。
研究方法：共纳入163名受试者，对其开展神经科、认知及功能评估访谈，将受试者分为痴呆组与无痴呆认知障碍（Cognitive Impairment No Dementia, CIND）组。
研究结果：共有11.4%（n=18）的受试者出现认知障碍，其中10例被诊断为无痴呆认知障碍（CIND），8例确诊为痴呆症。在50岁及以上的受试者中，痴呆症患病率为4.9%，无痴呆认知障碍患病率为6.1%；仅针对64岁以上老年群体进行分析时，痴呆症患病率达12.3%，无痴呆认知障碍患病率为7.7%。
研究结论：在本次研究的同质人群中，我们观测到的痴呆症患病率与巴西及其他发达国家、发展中国家相关研究报告的结果相近。