{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T09:20:06Z","timestamp":1787563206596,"version":"build-2736575974"},"reference-count":52,"publisher":"American Medical Association (AMA)","issue":"9","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Netw Open"],"abstract":"\n Importance<\/jats:title>\n \n Fine particulate matter air pollution (PM\n 2.5<\/jats:sub>\n ) has been consistently associated with cardiovascular disease, which, in turn, is associated with an increased risk of dementia. As such, vascular dysfunction might be a mechanism by which PM\n 2.5<\/jats:sub>\n mediates dementia risk, yet few prior epidemiological studies have examined this potential mechanism.\n <\/jats:p>\n <\/jats:sec>\n \n Objective<\/jats:title>\n \n To investigate whether hypertension and stroke serve as mediators and modifiers of the association of PM\n 2.5<\/jats:sub>\n with incident dementia.\n <\/jats:p>\n <\/jats:sec>\n \n Design, Setting, and Participants<\/jats:title>\n As part of the Environmental Predictors of Cognitive Health and Aging (EPOCH) Project, this cohort study used biennial survey data collected between 1998 and 2016 from respondents of the Health and Retirement Study (HRS), a nationally representative, population-based, cohort in the US. Eligible participants were those over 50 years of age who were free of dementia at baseline and had complete exposure, mediator, outcome, and demographic data from the HRS. Data analysis was conducted from August to November 2022.<\/jats:p>\n <\/jats:sec>\n \n Exposures<\/jats:title>\n \n Exposure to PM\n 2.5<\/jats:sub>\n , calculated for the 10 years preceding each person\u2019s baseline examination according to residential histories and spatiotemporal models.\n <\/jats:p>\n <\/jats:sec>\n \n Main Outcomes and Measures<\/jats:title>\n \n Incident dementia was identified using a validated algorithm based on cognitive testing and informant reports. The 4-way decomposition causal mediation analysis method was used to quantify the degree to which hypertension and stroke mediated or modified the association of PM\n 2.5<\/jats:sub>\n with incident dementia after adjustment for individual-level and area-level covariates.\n <\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n Among 27\u202f857 participants (mean [SD] age at baseline, 61 [10] years; 15\u202f747 female participants [56.5%]; 19\u202f249 non-Hispanic White participants [69.1%]), 4105 (14.7%) developed dementia during the follow-up period (mean [SD], 10.2 [5.6] years). Among participants with dementia, 2204 (53.7%) had a history of hypertension at baseline and 386 (9.4%) received a diagnosis of hypertension during the follow up. A total of 378 participants (9.2%) had a history of stroke at baseline and 673 (16.4%) developed stroke over the follow-up period. The IQR of baseline PM\n 2.5<\/jats:sub>\n concentrations was 10.9 to 14.9 \u03bcg\/m\n 3<\/jats:sup>\n . In fully adjusted models, higher levels of PM\n 2.5<\/jats:sub>\n (per IQR) were not associated with increased risk of incident dementia (HR, 1.04; 95% CI, 0.98 to 1.11). Although there were positive associations of prevalent stroke (HR, 1.67; 95% CI, 1.48 to 1.88) and hypertension (HR, 1.15; 95% CI, 1.08 to 1.23) with incident dementia compared with those free of stroke and hypertension during follow-up, there was no statistically significant association of PM\n 2.5<\/jats:sub>\n with stroke (odds ratio per IQR increment in PM\n 2.5<\/jats:sub>\n , 1.08; 95%CI, 0.91 to 1.29) and no evidence of an association of PM\n 2.5<\/jats:sub>\n with hypertension (odds ratio per IQR increment in PM2.5, 0.99; 95%CI, 0.92 to 1.07). Concordantly, there was no evidence that hypertension or stroke acted as mediators or modifiers of the association of PM\n 2.5<\/jats:sub>\n with incident dementia. Although the nonmediated interaction between PM\n 2.5<\/jats:sub>\n and hypertension accounted for 39.2% of the total excess association (95% CI, \u2212138.5% to 216.9%), the findings were not statistically significant.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions and Relevance<\/jats:title>\n \n These findings suggest that although hypertension may enhance the susceptibility of individuals to air pollution, hypertension and stroke do not significantly mediate or modify the association of PM\n 2.5<\/jats:sub>\n with dementia, indicating the need to investigate other pathways and potential mediators of risk.\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1001\/jamanetworkopen.2023.33470","type":"journal-article","created":{"date-parts":[[2023,9,20]],"date-time":"2023-09-20T11:11:02Z","timestamp":1695208262000},"page":"e2333470","source":"Crossref","is-referenced-by-count":38,"title":["Hypertension and Stroke as Mediators of Air Pollution Exposure and Incident 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