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Air Pollution and Incidence of Dementia

痴呆 医学 空气污染 入射(几何) 内科学 环境卫生 化学 光学 物理 有机化学 疾病
作者
Ehsan Abolhasani,Vladimir Hachinski,Nargess Ghazaleh,Mahmoud Reza Azarpazhooh,Naghmeh Mokhber,Janet Martin
出处
期刊:Neurology [Ovid Technologies (Wolters Kluwer)]
卷期号:100 (2) 被引量:44
标识
DOI:10.1212/wnl.0000000000201419
摘要

Studies of association between air pollution and incidence of dementia have shown discrepant results. The aim of this study was to evaluate the association between air pollution and dementia.In this systematic review and meta-analysis, PubMed, MEDLINE, EMBASE, PsycINFO, Scopus, and Web of Science were searched and updated in August 2021. Population-based cohort studies that reported on hazard ratio (HR) of dementia in association with exposure to fine particulate matter (PM2·5), nitrogen oxides (NOX), nitrogen dioxide (NO2), or ozone (O3) in those aged >40 years were included. Data were extracted by 2 independent investigators. The main outcome was the pooled HR for dementia per increment of pollutant, calculated using a random-effects model. Results were reported in accordance with PRISMA guidelines. The protocol was registered in PROSPERO (registration number: CRD42020219036).A total of 20 studies were included in the systematic review, and 17 provided data for the meta-analysis. The total included population was 91,391,296, with 5,521,111 (6%) being diagnosed with dementia. A total of 12, 5, 6, and 4 studies were included in the meta-analyses of PM2·5, NOX, NO2, and O3, respectively. The risk of dementia increased by 3% per 1 μg/m3 increment in PM2·5 (HR, 1.03; 95% CI [1.02-1.05]; I2 = 100%). The association between dementia per 10 μg/m3 increment in NOX (HR, 1.05; 95% CI [0.99-1.13]; I2 = 61%), NO2 (HR, 1.03; 95% CI [1.00-1.07]; I2 = 94%), and O3 levels (HR, 1.01; 95% CI [0.91-1.11]; I2 = 82%) was less clear, although a significant association could not be ruled out, and there was high heterogeneity across studies.Existing evidence suggests a significant association between exposure to PM2·5 and incidence of dementia and nonsignificant association between dementia and NOX, NO2, and O3 exposure. However, results should be interpreted in light of the small number of studies and high heterogeneity of effects across studies.
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