Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database

Background: The associations between ambient temperatures and stroke are still uncertain, although they have been widely studied. Furthermore, the impact of latitudes or climate zones on these associations is still controversial. The Tropic of Cancer passes through the middle of Taiwan and divides i...

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Autores principales:	Che-Wei Lin, Po-Wei Chen, Wei-Min Liu, Jin-Yi Hsu, Yu-Lun Huang, Yu Cheng, An-Bang Liu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ambient temperature stroke event nonlinear analysis temporal association Medicine R
Acceso en línea:	https://doaj.org/article/ec5206ef9ead4e23bcff7ea928c00ca9
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spelling	oai:doaj.org-article:ec5206ef9ead4e23bcff7ea928c00ca92021-11-11T17:39:44ZDynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database10.3390/jcm102150412077-0383https://doaj.org/article/ec5206ef9ead4e23bcff7ea928c00ca92021-10-01T00:00:00Zhttps://www.mdpi.com/2077-0383/10/21/5041https://doaj.org/toc/2077-0383Background: The associations between ambient temperatures and stroke are still uncertain, although they have been widely studied. Furthermore, the impact of latitudes or climate zones on these associations is still controversial. The Tropic of Cancer passes through the middle of Taiwan and divides it into subtropical and tropical areas. Therefore, the Taiwan National Health Insurance Database can be used to study the influence of latitudes on the association between ambient temperature and stroke events. Methods: In this study, we retrieved daily stroke events from 2010 to 2015 in the New Taipei and Taipei Cities (the subtropical areas) and Kaohsiung City (the tropical area) from the National Health Insurance Research Database. Overall, 70,338 and 125,163 stroke events, including ischemic stroke and intracerebral hemorrhage, in Kaohsiung City and the Taipei Area were retrieved from the database, respectively. We also collected daily mean temperatures from the Taipei and Kaohsiung weather stations during the same period. The data were decomposed by ensemble empirical mode decomposition (EEMD) into several intrinsic mode functions (IMFs). There were consistent 6-period IMFs with intervals around 360 days in most decomposed data. Spearman’s rank correlation test showed moderate-to-strong correlations between the relevant IMFs of daily temperatures and events of stroke in both areas, which were higher in the northern area compared with those in the southern area. Conclusions: EEMD is a useful tool to demonstrate the regularity of stroke events and their associations with dynamic changes of the ambient temperature. Our results clearly demonstrate the temporal association between the ambient temperature and daily events of ischemic stroke and intracranial hemorrhage. It will contribute to planning a healthcare system for stroke seasonally. Further well-designed prospective studies are needed to elucidate the meaning of these associations.Che-Wei LinPo-Wei ChenWei-Min LiuJin-Yi HsuYu-Lun HuangYu ChengAn-Bang LiuMDPI AGarticleambient temperaturestroke eventnonlinear analysistemporal associationMedicineRENJournal of Clinical Medicine, Vol 10, Iss 5041, p 5041 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ambient temperature stroke event nonlinear analysis temporal association Medicine R
spellingShingle	ambient temperature stroke event nonlinear analysis temporal association Medicine R Che-Wei Lin Po-Wei Chen Wei-Min Liu Jin-Yi Hsu Yu-Lun Huang Yu Cheng An-Bang Liu Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database
description	Background: The associations between ambient temperatures and stroke are still uncertain, although they have been widely studied. Furthermore, the impact of latitudes or climate zones on these associations is still controversial. The Tropic of Cancer passes through the middle of Taiwan and divides it into subtropical and tropical areas. Therefore, the Taiwan National Health Insurance Database can be used to study the influence of latitudes on the association between ambient temperature and stroke events. Methods: In this study, we retrieved daily stroke events from 2010 to 2015 in the New Taipei and Taipei Cities (the subtropical areas) and Kaohsiung City (the tropical area) from the National Health Insurance Research Database. Overall, 70,338 and 125,163 stroke events, including ischemic stroke and intracerebral hemorrhage, in Kaohsiung City and the Taipei Area were retrieved from the database, respectively. We also collected daily mean temperatures from the Taipei and Kaohsiung weather stations during the same period. The data were decomposed by ensemble empirical mode decomposition (EEMD) into several intrinsic mode functions (IMFs). There were consistent 6-period IMFs with intervals around 360 days in most decomposed data. Spearman’s rank correlation test showed moderate-to-strong correlations between the relevant IMFs of daily temperatures and events of stroke in both areas, which were higher in the northern area compared with those in the southern area. Conclusions: EEMD is a useful tool to demonstrate the regularity of stroke events and their associations with dynamic changes of the ambient temperature. Our results clearly demonstrate the temporal association between the ambient temperature and daily events of ischemic stroke and intracranial hemorrhage. It will contribute to planning a healthcare system for stroke seasonally. Further well-designed prospective studies are needed to elucidate the meaning of these associations.
format	article
author	Che-Wei Lin Po-Wei Chen Wei-Min Liu Jin-Yi Hsu Yu-Lun Huang Yu Cheng An-Bang Liu
author_facet	Che-Wei Lin Po-Wei Chen Wei-Min Liu Jin-Yi Hsu Yu-Lun Huang Yu Cheng An-Bang Liu
author_sort	Che-Wei Lin
title	Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database
title_short	Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database
title_full	Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database
title_fullStr	Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database
title_full_unstemmed	Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database
title_sort	dynamic changes and temporal association with ambient temperatures: nonlinear analyses of stroke events from a national health insurance database
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ec5206ef9ead4e23bcff7ea928c00ca9
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Dynamic Changes and Temporal Association with Ambient Temperatures: Nonlinear Analyses of Stroke Events from a National Health Insurance Database

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