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Revealing the association between cerebrovascular accidents and ambient temperature: a meta-analysis

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Abstract

The association between cerebrovascular accidents (CVA) and weather has been described across several studies showing multiple conflicting results. In this paper, we aim to conduct a meta-analysis to further clarify this association, as well as to find the potential sources of heterogeneity. PubMed, EMBASE, and Google Scholar were searched from inception through 2015, for articles analyzing the correlation between the incidence of CVA and temperature. A pooled effect size (ES) was estimated using random effects model and expressed as absolute values. Subgroup analyses by type of CVA were also performed. Heterogeneity and influence of covariates—including geographic latitude of the study site, male percentage, average temperature, and time interval—were assessed by meta-regression analysis. Twenty-six articles underwent full data extraction and scoring. A total of 19,736 subjects with CVA from 12 different countries were included and grouped as ischemic strokes (IS; n = 14,199), intracerebral hemorrhages (ICH; n = 3798), and subarachnoid hemorrhages (SAH; n = 1739). Lower ambient temperature was significantly associated with increase in incidence of overall CVA when using unadjusted (pooled ES = 0.23, P < 0.001) and adjusted data (pooled ES = 0.03, P = 0.003). Subgroup analyses showed that lower temperature has higher impact on the incidence of ICH (pooled ES = 0.34, P < 0.001), than that of IS (pooled ES = 0.22, P < 0.001) and SAH (pooled ES = 0.11, P = 0.012). In meta-regression analysis, the geographic latitude of the study site was the most influencing factor on this association (Z-score = 8.68). Synthesis of the existing data provides evidence supporting that a lower ambient temperature increases the incidence of CVA. Further population-based studies conducted at negative latitudes are needed to clarify the influence of this factor.

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Authors and Affiliations

  1. Johns Hopkins School of Medicine, Baltimore, MD, USA

    Andrés Zorrilla-Vaca & Ryan Jacob Healy

  2. School of Medicine, Faculty of Health, Universidad del Valle, Cali, Colombia

    Andrés Zorrilla-Vaca & Melissa M. Silva-Medina

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  1. Andrés Zorrilla-Vaca
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  2. Ryan Jacob Healy
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  3. Melissa M. Silva-Medina
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Correspondence to Andrés Zorrilla-Vaca.

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Zorrilla-Vaca, A., Healy, R.J. & Silva-Medina, M.M. Revealing the association between cerebrovascular accidents and ambient temperature: a meta-analysis. Int J Biometeorol 61, 821–832 (2017). https://doi.org/10.1007/s00484-016-1260-6

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